649case RegexNodeKind.Bol: 728case RegexNodeKind.End or RegexNodeKind.EndZ when _regexTree.FindOptimizations.MaxPossibleLength is int maxLength: 1249Debug.Assert(target.LoopNode.Kind is RegexNodeKind.Setloop or RegexNodeKind.Setlazy or RegexNodeKind.Setloopatomic); 1432Debug.Assert(node.Kind == RegexNodeKind.Capture, "Every generated tree should begin with a capture node"); 1442case RegexNodeKind.Multi or RegexNodeKind.Notone or RegexNodeKind.One or RegexNodeKind.Set: 1448int length = node.Kind == RegexNodeKind.Multi ? node.Str!.Length : 1; 1648Debug.Assert(node.Kind is RegexNodeKind.Alternate, $"Unexpected type: {node.Kind}"); 1853Debug.Assert(node.Kind is RegexNodeKind.Backreference, $"Unexpected type: {node.Kind}"); 2028Debug.Assert(node.Kind is RegexNodeKind.BackreferenceConditional, $"Unexpected type: {node.Kind}"); 2042RegexNode? noBranch = node.Child(1) is { Kind: not RegexNodeKind.Empty } childNo ? childNo : null; 2187Debug.Assert(node.Kind is RegexNodeKind.ExpressionConditional, $"Unexpected type: {node.Kind}"); 2203RegexNode? noBranch = node.Child(2) is { Kind: not RegexNodeKind.Empty } childNo ? childNo : null; 2387Debug.Assert(node.Kind is RegexNodeKind.Capture, $"Unexpected type: {node.Kind}"); 2513Debug.Assert(node.Kind is RegexNodeKind.PositiveLookaround, $"Unexpected type: {node.Kind}"); 2564Debug.Assert(node.Kind is RegexNodeKind.NegativeLookaround, $"Unexpected type: {node.Kind}"); 2721case RegexNodeKind.Beginning: 2722case RegexNodeKind.Start: 2723case RegexNodeKind.Bol: 2724case RegexNodeKind.Eol: 2725case RegexNodeKind.End: 2726case RegexNodeKind.EndZ: 2730case RegexNodeKind.Boundary: 2731case RegexNodeKind.NonBoundary: 2732case RegexNodeKind.ECMABoundary: 2733case RegexNodeKind.NonECMABoundary: 2737case RegexNodeKind.Multi: 2741case RegexNodeKind.One: 2742case RegexNodeKind.Notone: 2743case RegexNodeKind.Set: 2747case RegexNodeKind.Oneloop: 2748case RegexNodeKind.Notoneloop: 2749case RegexNodeKind.Setloop: 2753case RegexNodeKind.Onelazy: 2754case RegexNodeKind.Notonelazy: 2755case RegexNodeKind.Setlazy: 2759case RegexNodeKind.Oneloopatomic: 2760case RegexNodeKind.Notoneloopatomic: 2761case RegexNodeKind.Setloopatomic: 2765case RegexNodeKind.Loop: 2769case RegexNodeKind.Lazyloop: 2773case RegexNodeKind.Alternate: 2777case RegexNodeKind.Concatenate: 2781case RegexNodeKind.Atomic: 2785case RegexNodeKind.Backreference: 2789case RegexNodeKind.BackreferenceConditional: 2793case RegexNodeKind.ExpressionConditional: 2797case RegexNodeKind.Capture: 2801case RegexNodeKind.PositiveLookaround: 2805case RegexNodeKind.NegativeLookaround: 2809case RegexNodeKind.Nothing: 2813case RegexNodeKind.Empty: 2817case RegexNodeKind.UpdateBumpalong: 2829Debug.Assert(node.Kind is RegexNodeKind.Atomic or RegexNodeKind.PositiveLookaround or RegexNodeKind.NegativeLookaround or RegexNodeKind.ExpressionConditional, $"Unexpected type: {node.Kind}"); 2830Debug.Assert(node.Kind is RegexNodeKind.ExpressionConditional ? node.ChildCount() >= 1 : node.ChildCount() == 1, $"Unexpected number of children: {node.ChildCount()}"); 2871Debug.Assert(node.Kind is RegexNodeKind.UpdateBumpalong, $"Unexpected type: {node.Kind}"); 2891Debug.Assert(node.Kind is RegexNodeKind.Concatenate, $"Unexpected type: {node.Kind}"); 2949if (next.Kind is not RegexNodeKind.UpdateBumpalong) // skip node types that don't have a semantic impact 3037Debug.Assert(node.Kind is RegexNodeKind.Boundary or RegexNodeKind.NonBoundary or RegexNodeKind.ECMABoundary or RegexNodeKind.NonECMABoundary, $"Unexpected type: {node.Kind}"); 3055case RegexNodeKind.Boundary or RegexNodeKind.NonBoundary: 3069if (node.Kind is RegexNodeKind.Boundary) 3082if (node.Kind is RegexNodeKind.ECMABoundary) 3097Debug.Assert(node.Kind is RegexNodeKind.Beginning or RegexNodeKind.Start or RegexNodeKind.Bol or RegexNodeKind.End or RegexNodeKind.EndZ or RegexNodeKind.Eol, $"Unexpected type: {node.Kind}"); 3104case RegexNodeKind.Beginning: 3105case RegexNodeKind.Start: 3116if (node.Kind == RegexNodeKind.Beginning) 3128case RegexNodeKind.Bol: 3159case RegexNodeKind.End: 3176case RegexNodeKind.EndZ: 3193goto case RegexNodeKind.Eol; 3195case RegexNodeKind.Eol: 3235Debug.Assert(node.Kind is RegexNodeKind.Multi, $"Unexpected type: {node.Kind}"); 3287Debug.Assert(node.Kind is RegexNodeKind.Oneloop or RegexNodeKind.Notoneloop or RegexNodeKind.Setloop, $"Unexpected type: {node.Kind}"); 3503Debug.Assert(node.Kind is RegexNodeKind.Onelazy or RegexNodeKind.Notonelazy or RegexNodeKind.Setlazy, $"Unexpected type: {node.Kind}"); 3604node.Kind is RegexNodeKind.Notonelazy && 3745node.Kind is RegexNodeKind.Setlazy && 3850Debug.Assert(node.Kind is RegexNodeKind.Lazyloop, $"Unexpected type: {node.Kind}"); 4361Debug.Assert(node.Kind is RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic or RegexNodeKind.Notoneloop or RegexNodeKind.Notoneloopatomic or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic, $"Unexpected type: {node.Kind}"); 4608Debug.Assert(node.Kind is RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic or RegexNodeKind.Notoneloop or RegexNodeKind.Notoneloopatomic or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic, $"Unexpected type: {node.Kind}"); 4697Debug.Assert(node.Kind is RegexNodeKind.Loop or RegexNodeKind.Lazyloop, $"Unexpected type: {node.Kind}"); 4735Debug.Assert(node.Kind is RegexNodeKind.Loop or RegexNodeKind.Lazyloop, $"Unexpected type: {node.Kind}"); 5133if (node.Kind == RegexNodeKind.Multi) 5166if (node.Kind == RegexNodeKind.Multi) 5359if (root.Kind is RegexNodeKind.Multi or RegexNodeKind.One or RegexNodeKind.Notone or RegexNodeKind.Set) 5377Ldc((root.Kind == RegexNodeKind.Multi ? root.Str!.Length : 1) * (!rtl ? 1 : -1));

56if (rightToLeft && LeadingAnchor == RegexNodeKind.Bol) 59LeadingAnchor = RegexNodeKind.Unknown; 61if (LeadingAnchor is RegexNodeKind.Beginning or RegexNodeKind.Start or RegexNodeKind.EndZ or RegexNodeKind.End) 65(RegexNodeKind.Beginning, false) => FindNextStartingPositionMode.LeadingAnchor_LeftToRight_Beginning, 66(RegexNodeKind.Beginning, true) => FindNextStartingPositionMode.LeadingAnchor_RightToLeft_Beginning, 67(RegexNodeKind.Start, false) => FindNextStartingPositionMode.LeadingAnchor_LeftToRight_Start, 68(RegexNodeKind.Start, true) => FindNextStartingPositionMode.LeadingAnchor_RightToLeft_Start, 69(RegexNodeKind.End, false) => FindNextStartingPositionMode.LeadingAnchor_LeftToRight_End, 70(RegexNodeKind.End, true) => FindNextStartingPositionMode.LeadingAnchor_RightToLeft_End, 83if (TrailingAnchor is RegexNodeKind.End or RegexNodeKind.EndZ && 90FindMode = TrailingAnchor == RegexNodeKind.End ? 280LeadingAnchor == RegexNodeKind.Bol; // there's a leading BOL anchor we can otherwise search for 286public RegexNodeKind LeadingAnchor { get; private set; } 289public RegexNodeKind TrailingAnchor { get; } 409Debug.Assert(LeadingAnchor != RegexNodeKind.Bol, "BOL isn't enabled for RTL"); 535if (LeadingAnchor == RegexNodeKind.Bol) 822Debug.Assert(loopNode.Kind is RegexNodeKind.Setloop or RegexNodeKind.Setlazy or RegexNodeKind.Setloopatomic);

23public RegexNodeKind Kind { get; private set; } 26/// <remarks>For a <see cref="RegexNodeKind.Multi"/>, this is the string from the expression. For an <see cref="IsSetFamily"/> node, this is the character class string from <see cref="RegexCharClass"/>.</remarks> 51public RegexNode(RegexNodeKind kind, RegexOptions options) 57public RegexNode(RegexNodeKind kind, RegexOptions options, char ch) 64public RegexNode(RegexNodeKind kind, RegexOptions options, string str) 71public RegexNode(RegexNodeKind kind, RegexOptions options, int m) 78public RegexNode(RegexNodeKind kind, RegexOptions options, int m, int n) 89Debug.Assert(Kind is RegexNodeKind.Onelazy or RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic or 90RegexNodeKind.Notonelazy or RegexNodeKind.Notoneloop or RegexNodeKind.Notoneloopatomic or 91RegexNodeKind.Setlazy or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic); 121return new RegexNode(RegexNodeKind.One, options & ~RegexOptions.IgnoreCase, ch); 127return new RegexNode(RegexNodeKind.Set, options & ~RegexOptions.IgnoreCase, stringSet); 131return new RegexNode(RegexNodeKind.One, options, ch); 138Kind == RegexNodeKind.Concatenate && 150private void MakeRep(RegexNodeKind kind, int min, int max) 152Kind += kind - RegexNodeKind.One; 169case RegexNodeKind.Oneloop or RegexNodeKind.Notoneloop or RegexNodeKind.Setloop: 172Kind += RegexNodeKind.Oneloopatomic - RegexNodeKind.Oneloop; 175case RegexNodeKind.Onelazy or RegexNodeKind.Notonelazy or RegexNodeKind.Setlazy: 179Kind += RegexNodeKind.Oneloopatomic - RegexNodeKind.Onelazy; 189Kind = RegexNodeKind.Empty; 193else if (Kind == RegexNodeKind.Oneloopatomic && N is >= 2 and <= MultiVsRepeaterLimit) 197Kind = RegexNodeKind.Multi; 204case RegexNodeKind.Loop: 205if (Parent is not { Kind: RegexNodeKind.Atomic }) 207RegexNode loopAsChild = new(RegexNodeKind.Loop, Options, M, N); 208Kind = RegexNodeKind.Atomic; 215case RegexNodeKind.Lazyloop: 225goto case RegexNodeKind.Loop; 228Kind = RegexNodeKind.Empty; 243Debug.Assert(Kind == RegexNodeKind.Capture, "Every generated tree should begin with a capture node"); 262Debug.Assert(Kind != RegexNodeKind.Group, "All Group nodes should have been removed."); 267case RegexNodeKind.Group: 271case RegexNodeKind.Beginning: 272case RegexNodeKind.Bol: 273case RegexNodeKind.Boundary: 274case RegexNodeKind.ECMABoundary: 275case RegexNodeKind.Empty: 276case RegexNodeKind.End: 277case RegexNodeKind.EndZ: 278case RegexNodeKind.Eol: 279case RegexNodeKind.Multi: 280case RegexNodeKind.NonBoundary: 281case RegexNodeKind.NonECMABoundary: 282case RegexNodeKind.Nothing: 283case RegexNodeKind.Notone: 284case RegexNodeKind.Notonelazy: 285case RegexNodeKind.Notoneloop: 286case RegexNodeKind.Notoneloopatomic: 287case RegexNodeKind.One: 288case RegexNodeKind.Onelazy: 289case RegexNodeKind.Oneloop: 290case RegexNodeKind.Oneloopatomic: 291case RegexNodeKind.Backreference: 292case RegexNodeKind.Set: 293case RegexNodeKind.Setlazy: 294case RegexNodeKind.Setloop: 295case RegexNodeKind.Setloopatomic: 296case RegexNodeKind.Start: 297case RegexNodeKind.UpdateBumpalong: 301case RegexNodeKind.Atomic: 302case RegexNodeKind.Capture: 303case RegexNodeKind.Lazyloop: 304case RegexNodeKind.Loop: 305case RegexNodeKind.NegativeLookaround: 306case RegexNodeKind.PositiveLookaround: 310case RegexNodeKind.BackreferenceConditional: 314case RegexNodeKind.ExpressionConditional: 318case RegexNodeKind.Concatenate: 319case RegexNodeKind.Alternate: 331case RegexNodeKind.Multi: 336case RegexNodeKind.Set: 337case RegexNodeKind.Setloop: 338case RegexNodeKind.Setloopatomic: 339case RegexNodeKind.Setlazy: 351case RegexNodeKind.Backreference: 372Debug.Assert(rootNode.Kind == RegexNodeKind.Capture); 415case RegexNodeKind.Atomic: 419case RegexNodeKind.Concatenate: 424case RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic or RegexNodeKind.Notoneloop or RegexNodeKind.Notoneloopatomic or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic when node.N == int.MaxValue: 425case RegexNodeKind.Onelazy or RegexNodeKind.Notonelazy or RegexNodeKind.Setlazy when node.N == int.MaxValue && !atomicByAncestry: 426if (node.Parent is { Kind: RegexNodeKind.Concatenate } parent) 428parent.InsertChild(1, new RegexNode(RegexNodeKind.UpdateBumpalong, node.Options)); 476case RegexNodeKind.Oneloop or RegexNodeKind.Notoneloop or RegexNodeKind.Setloop: 477case RegexNodeKind.Onelazy or RegexNodeKind.Notonelazy or RegexNodeKind.Setlazy: 483case RegexNodeKind.Atomic: 484case RegexNodeKind.PositiveLookaround: 485case RegexNodeKind.NegativeLookaround: 495case RegexNodeKind.Capture: 496case RegexNodeKind.Concatenate when !rtl: 498if ((existingChild.Kind is RegexNodeKind.Alternate or RegexNodeKind.BackreferenceConditional or RegexNodeKind.ExpressionConditional or RegexNodeKind.Loop or RegexNodeKind.Lazyloop) && 499node.Parent is not { Kind: RegexNodeKind.Atomic }) // validate grandparent isn't atomic 501var atomic = new RegexNode(RegexNodeKind.Atomic, existingChild.Options); 511case RegexNodeKind.Alternate: 512case RegexNodeKind.BackreferenceConditional: 513case RegexNodeKind.ExpressionConditional: 521if (node.Kind != RegexNodeKind.ExpressionConditional) // ReduceExpressionConditional will have already applied ending backtracking removal 536case RegexNodeKind.Lazyloop: 537case RegexNodeKind.Loop: 542Debug.Assert(node.Kind is RegexNodeKind.Atomic or RegexNodeKind.Empty or RegexNodeKind.Loop or RegexNodeKind.Lazyloop); 544if (node.Kind is RegexNodeKind.Atomic) 547Debug.Assert(node.Kind is RegexNodeKind.Loop or RegexNodeKind.Lazyloop); 550if (node.Kind is RegexNodeKind.Loop or RegexNodeKind.Lazyloop) 584case RegexNodeKind.Backreference: 591RegexNodeKind.Alternate => ReduceAlternation(), 592RegexNodeKind.Atomic => ReduceAtomic(), 593RegexNodeKind.Concatenate => ReduceConcatenation(), 594RegexNodeKind.Group => ReduceGroup(), 595RegexNodeKind.Loop or RegexNodeKind.Lazyloop => ReduceLoops(), 596RegexNodeKind.PositiveLookaround or RegexNodeKind.NegativeLookaround => ReduceLookaround(), 597RegexNodeKind.Set or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic or RegexNodeKind.Setlazy => ReduceSet(), 598RegexNodeKind.ExpressionConditional => ReduceExpressionConditional(), 599RegexNodeKind.BackreferenceConditional => ReduceBackreferenceConditional(), 612Debug.Assert(Kind is RegexNodeKind.Alternate or RegexNodeKind.Concatenate); 6150 => new RegexNode(Kind == RegexNodeKind.Alternate ? RegexNodeKind.Nothing : RegexNodeKind.Empty, Options), 629Debug.Assert(Kind == RegexNodeKind.Group); 632while (u.Kind == RegexNodeKind.Group) 657Debug.Assert(Kind == RegexNodeKind.Atomic); 662while (child.Kind == RegexNodeKind.Atomic) 672case RegexNodeKind.Empty: 673case RegexNodeKind.Nothing: 677case RegexNodeKind.Oneloopatomic: 678case RegexNodeKind.Notoneloopatomic: 679case RegexNodeKind.Setloopatomic: 684case RegexNodeKind.Oneloop: 685case RegexNodeKind.Notoneloop: 686case RegexNodeKind.Setloop: 687case RegexNodeKind.Onelazy: 688case RegexNodeKind.Notonelazy: 689case RegexNodeKind.Setlazy: 695case RegexNodeKind.Alternate: 704if (branches[0].Kind == RegexNodeKind.Empty) 706return new RegexNode(RegexNodeKind.Empty, child.Options); 715if (branches[i].Kind == RegexNodeKind.Empty) 796(child.Child(0).Kind is RegexNodeKind.Empty || child.Child(1).Kind is RegexNodeKind.Empty); // can be transformed into a ? or ?? 811return child.Kind == RegexNodeKind.Empty ? 826Debug.Assert(Kind is RegexNodeKind.Loop or RegexNodeKind.Lazyloop); 829RegexNodeKind kind = Kind; 842if (kind == RegexNodeKind.Loop) 846case RegexNodeKind.Oneloop: 847case RegexNodeKind.Oneloopatomic: 848case RegexNodeKind.Notoneloop: 849case RegexNodeKind.Notoneloopatomic: 850case RegexNodeKind.Setloop: 851case RegexNodeKind.Setloopatomic: 860case RegexNodeKind.Onelazy: 861case RegexNodeKind.Notonelazy: 862case RegexNodeKind.Setlazy: 896return new RegexNode(RegexNodeKind.Nothing, Options); 907case RegexNodeKind.One: 908case RegexNodeKind.Notone: 909case RegexNodeKind.Set: 910child.MakeRep(u.Kind == RegexNodeKind.Lazyloop ? RegexNodeKind.Onelazy : RegexNodeKind.Oneloop, u.M, u.N); 914case RegexNodeKind.Empty: 919case RegexNodeKind.PositiveLookaround when ContainsKind(child, [RegexNodeKind.Capture]) is false: 920case RegexNodeKind.NegativeLookaround or 921RegexNodeKind.Beginning or RegexNodeKind.Start or 922RegexNodeKind.Bol or RegexNodeKind.Eol or 923RegexNodeKind.End or RegexNodeKind.EndZ or 924RegexNodeKind.Boundary or RegexNodeKind.ECMABoundary or 925RegexNodeKind.NonBoundary or RegexNodeKind.NonECMABoundary: 935u = u.M == 0 ? new RegexNode(RegexNodeKind.Empty, Options) : child; 958Debug.Assert(Kind is RegexNodeKind.Set or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic or RegexNodeKind.Setlazy); 963Kind = RegexNodeKind.Nothing; 971Kind == RegexNodeKind.Set ? RegexNodeKind.One : 972Kind == RegexNodeKind.Setloop ? RegexNodeKind.Oneloop : 973Kind == RegexNodeKind.Setloopatomic ? RegexNodeKind.Oneloopatomic : 974RegexNodeKind.Onelazy; 981Kind == RegexNodeKind.Set ? RegexNodeKind.Notone : 982Kind == RegexNodeKind.Setloop ? RegexNodeKind.Notoneloop : 983Kind == RegexNodeKind.Setloopatomic ? RegexNodeKind.Notoneloopatomic : 984RegexNodeKind.Notonelazy; 1018Debug.Assert(Kind == RegexNodeKind.Alternate); 1023return new RegexNode(RegexNodeKind.Nothing, Options); 1031if (node.Kind == RegexNodeKind.Alternate) 1034if (node.Kind == RegexNodeKind.Alternate) 1037if (node.Kind == RegexNodeKind.Alternate) 1045if (node.Kind is RegexNodeKind.Alternate && node.ChildCount() == 2) 1047if (node.Child(1).Kind is RegexNodeKind.Empty) 1051else if (node.Child(0).Kind is RegexNodeKind.Empty) 1088if (at.Kind == RegexNodeKind.Alternate) 1106else if (at.Kind is RegexNodeKind.Set or RegexNodeKind.One or RegexNodeKind.Notone) 1111if (at.Kind == RegexNodeKind.Set) 1135if (prev.Kind == RegexNodeKind.One) 1140else if (prev.Kind == RegexNodeKind.Notone) 1150if (at.Kind == RegexNodeKind.One) 1154else if (at.Kind == RegexNodeKind.Notone) 1164prev.Kind = RegexNodeKind.Set; 1171else if (at.Kind == RegexNodeKind.Nothing) 1195Debug.Assert(alternation.Kind == RegexNodeKind.Alternate); 1208if (child.Kind != RegexNodeKind.Concatenate || child.ChildCount() < 2) 1225case RegexNodeKind.One or RegexNodeKind.Notone or RegexNodeKind.Set: 1226case RegexNodeKind.Oneloopatomic or RegexNodeKind.Notoneloopatomic or RegexNodeKind.Setloopatomic: 1227case RegexNodeKind.Oneloop or RegexNodeKind.Notoneloop or RegexNodeKind.Setloop or RegexNodeKind.Onelazy or RegexNodeKind.Notonelazy or RegexNodeKind.Setlazy when required.M == required.N: 1228case RegexNodeKind.Beginning or RegexNodeKind.Start or RegexNodeKind.Bol 1229or RegexNodeKind.End or RegexNodeKind.EndZ or RegexNodeKind.Eol 1230or RegexNodeKind.Boundary or RegexNodeKind.ECMABoundary 1231or RegexNodeKind.NonBoundary or RegexNodeKind.NonECMABoundary: 1261var newAlternate = new RegexNode(RegexNodeKind.Alternate, alternation.Options); 1269if (alternation.Parent is RegexNode { Kind: RegexNodeKind.Atomic }) 1271var atomic = new RegexNode(RegexNodeKind.Atomic, alternation.Options); 1278var newConcat = new RegexNode(RegexNodeKind.Concatenate, alternation.Options); 1294Debug.Assert(node.Kind == RegexNodeKind.Alternate); 1305case RegexNodeKind.Empty when !seenEmpty: 1309case RegexNodeKind.Empty: 1310case RegexNodeKind.Nothing: 1337Debug.Assert(alternation.Kind == RegexNodeKind.Alternate); 1364if (startingNode.Kind == RegexNodeKind.One) 1384if (startingNode.Kind == RegexNodeKind.One) 1398Debug.Assert(startingNode.Kind == RegexNodeKind.Multi); 1429new RegexNode(RegexNodeKind.One, startingNodeOptions, startingSpan[0]) : 1430new RegexNode(RegexNodeKind.Multi, startingNodeOptions, startingSpan.ToString()); 1431var newAlternate = new RegexNode(RegexNodeKind.Alternate, startingNodeOptions); 1435ProcessOneOrMulti(branch.Kind == RegexNodeKind.Concatenate ? branch.Child(0) : branch, startingSpan); 1443if (node.Kind == RegexNodeKind.One) 1447node.Kind = RegexNodeKind.Empty; 1452Debug.Assert(node.Kind == RegexNodeKind.Multi); 1456node.Kind = RegexNodeKind.Empty; 1461node.Kind = RegexNodeKind.One; 1473if (alternation.Parent is RegexNode parent && parent.Kind == RegexNodeKind.Atomic) 1475var atomic = new RegexNode(RegexNodeKind.Atomic, startingNodeOptions); 1480var newConcat = new RegexNode(RegexNodeKind.Concatenate, startingNodeOptions); 1500RegexNode branch = Kind == RegexNodeKind.Concatenate ? Child(0) : this; 1501return branch.Kind is RegexNodeKind.One or RegexNodeKind.Multi ? branch : null; 1507Debug.Assert(Kind is RegexNodeKind.One or RegexNodeKind.Multi || (IsOneFamily && M > 0)); 1522case RegexNodeKind.One: 1523case RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic or RegexNodeKind.Onelazy when node.M > 0: 1524case RegexNodeKind.Notone: 1525case RegexNodeKind.Notoneloop or RegexNodeKind.Notoneloopatomic or RegexNodeKind.Notonelazy when node.M > 0: 1526case RegexNodeKind.Set: 1527case RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic or RegexNodeKind.Setlazy when node.M > 0: 1528case RegexNodeKind.Multi: 1531case RegexNodeKind.Atomic: 1532case RegexNodeKind.Concatenate: 1533case RegexNodeKind.Capture: 1534case RegexNodeKind.Group: 1535case RegexNodeKind.Loop or RegexNodeKind.Lazyloop when node.M > 0: 1536case RegexNodeKind.PositiveLookaround when allowZeroWidth: 1557case RegexNodeKind.One or RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic or RegexNodeKind.Onelazy: 1560case RegexNodeKind.Notone or RegexNodeKind.Notoneloop or RegexNodeKind.Notoneloopatomic or RegexNodeKind.Notonelazy: 1563case RegexNodeKind.Set or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic or RegexNodeKind.Setlazy: 1579case RegexNodeKind.Multi: 1622Debug.Assert(Kind == RegexNodeKind.Concatenate); 1628return new RegexNode(RegexNodeKind.Empty, Options); 1638if (child.Kind == RegexNodeKind.Nothing) 1664Debug.Assert(Kind == RegexNodeKind.Concatenate); 1681if (at.Kind == RegexNodeKind.Concatenate && 1700else if (at.Kind is RegexNodeKind.Multi or RegexNodeKind.One) 1714if (prev.Kind == RegexNodeKind.One) 1716prev.Kind = RegexNodeKind.Multi; 1721((at.Kind == RegexNodeKind.One) ? $"{prev.Str}{at.Ch}" : prev.Str + at.Str) : 1722((at.Kind == RegexNodeKind.One) ? $"{at.Ch}{prev.Str}" : at.Str + prev.Str); 1724else if (at.Kind == RegexNodeKind.Empty) 1747Debug.Assert(Kind == RegexNodeKind.Concatenate); 1785case RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic or RegexNodeKind.Onelazy or RegexNodeKind.Notoneloop or RegexNodeKind.Notoneloopatomic or RegexNodeKind.Notonelazy when nextNode.Kind == currentNode.Kind && currentNode.Ch == nextNode.Ch: 1786case RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic or RegexNodeKind.Setlazy when nextNode.Kind == currentNode.Kind && currentNode.Str == nextNode.Str: 1788currentNode.Kind is RegexNodeKind.Oneloopatomic or RegexNodeKind.Notoneloopatomic or RegexNodeKind.Setloopatomic) 1811case RegexNodeKind.Oneloop or RegexNodeKind.Onelazy when nextNode.Kind == RegexNodeKind.One && currentNode.Ch == nextNode.Ch: 1812case RegexNodeKind.Notoneloop or RegexNodeKind.Notonelazy when nextNode.Kind == RegexNodeKind.Notone && currentNode.Ch == nextNode.Ch: 1813case RegexNodeKind.Setloop or RegexNodeKind.Setlazy when nextNode.Kind == RegexNodeKind.Set && currentNode.Str == nextNode.Str: 1827case RegexNodeKind.Oneloop or RegexNodeKind.Onelazy when 1828nextNode.Kind == RegexNodeKind.Multi && 1861nextNode.Kind = RegexNodeKind.One; 1879case RegexNodeKind.One when (nextNode.Kind is RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic or RegexNodeKind.Onelazy) && currentNode.Ch == nextNode.Ch: 1880case RegexNodeKind.Notone when (nextNode.Kind is RegexNodeKind.Notoneloop or RegexNodeKind.Notoneloopatomic or RegexNodeKind.Notonelazy) && currentNode.Ch == nextNode.Ch: 1881case RegexNodeKind.Set when (nextNode.Kind is RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic or RegexNodeKind.Setlazy) && currentNode.Str == nextNode.Str: 1894case RegexNodeKind.Notone when nextNode.Kind == currentNode.Kind && currentNode.Ch == nextNode.Ch: 1895case RegexNodeKind.Set when nextNode.Kind == RegexNodeKind.Set && currentNode.Str == nextNode.Str: 1896currentNode.MakeRep(RegexNodeKind.Oneloop, 2, 2); 1901case RegexNodeKind.Beginning or RegexNodeKind.Start or 1902RegexNodeKind.End or RegexNodeKind.EndZ or 1903RegexNodeKind.Bol or RegexNodeKind.Eol or 1904RegexNodeKind.Boundary or RegexNodeKind.NonBoundary or 1905RegexNodeKind.ECMABoundary or RegexNodeKind.NonECMABoundary 1949if (Kind is not RegexNodeKind.Concatenate) 1973while (node.Kind is RegexNodeKind.Capture or RegexNodeKind.Concatenate) 1981case RegexNodeKind.Oneloop or RegexNodeKind.Notoneloop or RegexNodeKind.Setloop when CanBeMadeAtomic(node, subsequent, iterateNullableSubsequent: true, allowLazy: false): 1990case RegexNodeKind.Onelazy or RegexNodeKind.Notonelazy or RegexNodeKind.Setlazy when CanBeMadeAtomic(node, subsequent, iterateNullableSubsequent: false, allowLazy: true): 2006node.Kind -= RegexNodeKind.Onelazy - RegexNodeKind.Oneloop; // lazy to greedy 2010case RegexNodeKind.Loop when CanBeMadeAtomic(node, subsequent, iterateNullableSubsequent: true, allowLazy: false): 2011case RegexNodeKind.Lazyloop when CanBeMadeAtomic(node, subsequent, iterateNullableSubsequent: false, allowLazy: true): 2025while (loopChild.Kind is RegexNodeKind.Capture or RegexNodeKind.Concatenate) 2031RegexNodeKind.Boundary or RegexNodeKind.ECMABoundary or 2032RegexNodeKind.Multi or 2033RegexNodeKind.One or RegexNodeKind.Notone or RegexNodeKind.Set) 2038else if (node.Kind is RegexNodeKind.Loop or RegexNodeKind.Lazyloop) 2042goto case RegexNodeKind.Loop; 2050case RegexNodeKind.Loop: 2060case RegexNodeKind.Lazyloop: 2070case RegexNodeKind.Alternate or RegexNodeKind.BackreferenceConditional or RegexNodeKind.ExpressionConditional: 2081for (int b = node.Kind == RegexNodeKind.ExpressionConditional ? 1 : 0; b < alternateBranches; b++) 2095Debug.Assert(Kind is RegexNodeKind.PositiveLookaround or RegexNodeKind.NegativeLookaround); 2101if (Kind is RegexNodeKind.NegativeLookaround && ContainsKind(Child(0), [RegexNodeKind.Backreference, RegexNodeKind.BackreferenceConditional]) is false) 2114if (node.Kind is RegexNodeKind.Capture) 2145if (Kind is RegexNodeKind.PositiveLookaround) 2148child.Kind is RegexNodeKind.Empty) 2153else if (Kind is RegexNodeKind.NegativeLookaround) 2158if (child.Kind is RegexNodeKind.Empty) 2160Kind = RegexNodeKind.Nothing; 2168private static bool IsZeroWidthAssertion(RegexNodeKind kind) => kind is 2169RegexNodeKind.PositiveLookaround or RegexNodeKind.NegativeLookaround or 2170RegexNodeKind.Beginning or RegexNodeKind.Start or 2171RegexNodeKind.Bol or RegexNodeKind.Eol or 2172RegexNodeKind.End or RegexNodeKind.EndZ or 2173RegexNodeKind.Boundary or RegexNodeKind.ECMABoundary or 2174RegexNodeKind.NonBoundary or RegexNodeKind.NonECMABoundary or 2175RegexNodeKind.UpdateBumpalong; 2179private static bool? ContainsKind(RegexNode node, ReadOnlySpan<RegexNodeKind> kinds) 2181foreach (RegexNodeKind kind in kinds) 2211Debug.Assert(Kind == RegexNodeKind.BackreferenceConditional); 2220AddChild(new RegexNode(RegexNodeKind.Empty, Options)); 2229Debug.Assert(Kind == RegexNodeKind.ExpressionConditional); 2238AddChild(new RegexNode(RegexNodeKind.Empty, Options)); 2247if (condition.Kind == RegexNodeKind.PositiveLookaround && (condition.Options & RegexOptions.RightToLeft) == 0) 2274while (node.Kind is RegexNodeKind.Capture or RegexNodeKind.Concatenate) 2292case RegexNodeKind.Concatenate: 2293case RegexNodeKind.Capture: 2294case RegexNodeKind.Atomic: 2298case RegexNodeKind.Loop or RegexNodeKind.Lazyloop when subsequent.M > 0: 2306case RegexNodeKind.PositiveLookaround when (subsequent.Options & RegexOptions.RightToLeft) == 0: 2330case RegexNodeKind.Alternate: 2331case RegexNodeKind.ExpressionConditional when childCount is 3: // condition, yes, and no branch 2346case RegexNodeKind.Oneloop: 2347case RegexNodeKind.Onelazy when allowLazy: 2350case RegexNodeKind.One when node.Ch != subsequent.Ch: 2351case RegexNodeKind.Notone when node.Ch == subsequent.Ch: 2352case RegexNodeKind.Set when !RegexCharClass.CharInClass(node.Ch, subsequent.Str!): 2353case RegexNodeKind.Onelazy or RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic when subsequent.M > 0 && node.Ch != subsequent.Ch: 2354case RegexNodeKind.Notonelazy or RegexNodeKind.Notoneloop or RegexNodeKind.Notoneloopatomic when subsequent.M > 0 && node.Ch == subsequent.Ch: 2355case RegexNodeKind.Setlazy or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic when subsequent.M > 0 && !RegexCharClass.CharInClass(node.Ch, subsequent.Str!): 2356case RegexNodeKind.Multi when node.Ch != subsequent.Str![0]: 2357case RegexNodeKind.End: 2358case RegexNodeKind.EndZ or RegexNodeKind.Eol when node.Ch != '\n': 2359case RegexNodeKind.Boundary when node.M > 0 && RegexCharClass.IsBoundaryWordChar(node.Ch): 2360case RegexNodeKind.NonBoundary when node.M > 0 && !RegexCharClass.IsBoundaryWordChar(node.Ch): 2361case RegexNodeKind.ECMABoundary when node.M > 0 && RegexCharClass.IsECMAWordChar(node.Ch): 2362case RegexNodeKind.NonECMABoundary when node.M > 0 && !RegexCharClass.IsECMAWordChar(node.Ch): 2365case RegexNodeKind.Onelazy or RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic when subsequent.M == 0 && node.Ch != subsequent.Ch: 2366case RegexNodeKind.Notonelazy or RegexNodeKind.Notoneloop or RegexNodeKind.Notoneloopatomic when subsequent.M == 0 && node.Ch == subsequent.Ch: 2367case RegexNodeKind.Setlazy or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic when subsequent.M == 0 && !RegexCharClass.CharInClass(node.Ch, subsequent.Str!): 2376case RegexNodeKind.Notoneloop: 2377case RegexNodeKind.Notonelazy when allowLazy: 2380case RegexNodeKind.One when node.Ch == subsequent.Ch: 2381case RegexNodeKind.Onelazy or RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic when subsequent.M > 0 && node.Ch == subsequent.Ch: 2382case RegexNodeKind.Multi when node.Ch == subsequent.Str![0]: 2383case RegexNodeKind.End: 2386case RegexNodeKind.Onelazy or RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic when subsequent.M == 0 && node.Ch == subsequent.Ch: 2395case RegexNodeKind.Setloop: 2396case RegexNodeKind.Setlazy when allowLazy: 2399case RegexNodeKind.One when !RegexCharClass.CharInClass(subsequent.Ch, node.Str!): 2400case RegexNodeKind.Set when !RegexCharClass.MayOverlap(node.Str!, subsequent.Str!): 2401case RegexNodeKind.Onelazy or RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic when subsequent.M > 0 && !RegexCharClass.CharInClass(subsequent.Ch, node.Str!): 2402case RegexNodeKind.Setlazy or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic when subsequent.M > 0 && !RegexCharClass.MayOverlap(node.Str!, subsequent.Str!): 2403case RegexNodeKind.Multi when !RegexCharClass.CharInClass(subsequent.Str![0], node.Str!): 2404case RegexNodeKind.End: 2405case RegexNodeKind.EndZ or RegexNodeKind.Eol when !RegexCharClass.CharInClass('\n', node.Str!): 2406case RegexNodeKind.Boundary when node.M > 0 && RegexCharClass.IsKnownWordClassSubset(node.Str!): 2407case RegexNodeKind.NonBoundary when node.M > 0 && node.Str is RegexCharClass.NotWordClass or RegexCharClass.NotDigitClass: 2408case RegexNodeKind.ECMABoundary when node.M > 0 && node.Str is RegexCharClass.ECMAWordClass or RegexCharClass.ECMADigitClass: 2409case RegexNodeKind.NonECMABoundary when node.M > 0 && node.Str is RegexCharClass.NotECMAWordClass or RegexCharClass.NotDigitClass: 2412case RegexNodeKind.Onelazy or RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic when subsequent.M == 0 && !RegexCharClass.CharInClass(subsequent.Ch, node.Str!): 2413case RegexNodeKind.Setlazy or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic when subsequent.M == 0 && !RegexCharClass.MayOverlap(node.Str!, subsequent.Str!): 2422case RegexNodeKind.Loop: 2423case RegexNodeKind.Lazyloop when allowLazy: 2446case RegexNodeKind.One when !CharInStartingOrEndingSet(subsequent.Ch): 2447case RegexNodeKind.Set when !MayOverlapStartingOrEndingSet(subsequent.Str!): 2448case RegexNodeKind.Onelazy or RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic when subsequent.M > 0 && !CharInStartingOrEndingSet(subsequent.Ch): 2449case RegexNodeKind.Setlazy or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic when subsequent.M > 0 && !MayOverlapStartingOrEndingSet(subsequent.Str!): 2450case RegexNodeKind.Multi when !CharInStartingOrEndingSet(subsequent.Str![0]): 2451case RegexNodeKind.End: 2452case RegexNodeKind.EndZ or RegexNodeKind.Eol when !CharInStartingOrEndingSet('\n'): 2453case RegexNodeKind.Boundary when node.M > 0 && RegexCharClass.IsKnownWordClassSubset(loopStartingSet) && RegexCharClass.IsKnownWordClassSubset(loopEndingSet): 2454case RegexNodeKind.NonBoundary when node.M > 0 && (loopStartingSet is RegexCharClass.NotWordClass or RegexCharClass.NotDigitClass) && (loopEndingSet is RegexCharClass.NotWordClass or RegexCharClass.NotDigitClass): 2455case RegexNodeKind.ECMABoundary when node.M > 0 && (loopStartingSet is RegexCharClass.ECMAWordClass or RegexCharClass.ECMADigitClass) && (loopEndingSet is RegexCharClass.ECMAWordClass or RegexCharClass.ECMADigitClass): 2456case RegexNodeKind.NonECMABoundary when node.M > 0 && (loopStartingSet is RegexCharClass.NotECMAWordClass or RegexCharClass.NotDigitClass) && (loopEndingSet is RegexCharClass.NotECMAWordClass or RegexCharClass.NotDigitClass): 2459case RegexNodeKind.Onelazy or RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic when subsequent.M == 0 && !CharInStartingOrEndingSet(subsequent.Ch): 2460case RegexNodeKind.Setlazy or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic when subsequent.M == 0 && !MayOverlapStartingOrEndingSet(subsequent.Str!): 2488case RegexNodeKind.Atomic: 2489case RegexNodeKind.Alternate: 2490case RegexNodeKind.Capture: 2494case RegexNodeKind.Concatenate: 2533Debug.Assert(node.Kind is not RegexNodeKind.Concatenate, "The existing logic assumes that the node itself isn't a concatenation."); 2546case RegexNodeKind.Atomic: 2547case RegexNodeKind.Alternate: 2548case RegexNodeKind.Capture: 2552case RegexNodeKind.Concatenate: 2588case RegexNodeKind.One: 2589case RegexNodeKind.Notone: 2590case RegexNodeKind.Set: 2594case RegexNodeKind.Multi: 2598case RegexNodeKind.Notonelazy: 2599case RegexNodeKind.Notoneloop: 2600case RegexNodeKind.Notoneloopatomic: 2601case RegexNodeKind.Onelazy: 2602case RegexNodeKind.Oneloop: 2603case RegexNodeKind.Oneloopatomic: 2604case RegexNodeKind.Setlazy: 2605case RegexNodeKind.Setloop: 2606case RegexNodeKind.Setloopatomic: 2610case RegexNodeKind.Lazyloop: 2611case RegexNodeKind.Loop: 2615case RegexNodeKind.Alternate: 2628case RegexNodeKind.BackreferenceConditional: 2632case RegexNodeKind.ExpressionConditional: 2636case RegexNodeKind.Concatenate: 2648case RegexNodeKind.Atomic: 2649case RegexNodeKind.Capture: 2650case RegexNodeKind.Group: 2655case RegexNodeKind.Empty: 2656case RegexNodeKind.Nothing: 2657case RegexNodeKind.UpdateBumpalong: 2661case RegexNodeKind.Beginning: 2662case RegexNodeKind.Bol: 2663case RegexNodeKind.Boundary: 2664case RegexNodeKind.ECMABoundary: 2665case RegexNodeKind.End: 2666case RegexNodeKind.EndZ: 2667case RegexNodeKind.Eol: 2668case RegexNodeKind.NonBoundary: 2669case RegexNodeKind.NonECMABoundary: 2670case RegexNodeKind.Start: 2671case RegexNodeKind.NegativeLookaround: 2672case RegexNodeKind.PositiveLookaround: 2674case RegexNodeKind.Backreference: 2682goto case RegexNodeKind.Empty; 2701case RegexNodeKind.One: 2702case RegexNodeKind.Notone: 2703case RegexNodeKind.Set: 2707case RegexNodeKind.Multi: 2711case RegexNodeKind.Notonelazy or RegexNodeKind.Notoneloop or RegexNodeKind.Notoneloopatomic or 2712RegexNodeKind.Onelazy or RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic or 2713RegexNodeKind.Setlazy or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic: 2717case RegexNodeKind.Loop or RegexNodeKind.Lazyloop: 2732case RegexNodeKind.Alternate: 2755case RegexNodeKind.BackreferenceConditional: 2756case RegexNodeKind.ExpressionConditional: 2759int i = Kind == RegexNodeKind.BackreferenceConditional ? 0 : 1; 2765case RegexNodeKind.Concatenate: 2787case RegexNodeKind.Atomic: 2788case RegexNodeKind.Capture: 2793case RegexNodeKind.Empty: 2794case RegexNodeKind.Nothing: 2795case RegexNodeKind.UpdateBumpalong: 2796case RegexNodeKind.Beginning: 2797case RegexNodeKind.Bol: 2798case RegexNodeKind.Boundary: 2799case RegexNodeKind.ECMABoundary: 2800case RegexNodeKind.End: 2801case RegexNodeKind.EndZ: 2802case RegexNodeKind.Eol: 2803case RegexNodeKind.NonBoundary: 2804case RegexNodeKind.NonECMABoundary: 2805case RegexNodeKind.Start: 2806case RegexNodeKind.PositiveLookaround: 2807case RegexNodeKind.NegativeLookaround: 2811case RegexNodeKind.Backreference: 2819goto case RegexNodeKind.Empty; 2842Debug.Assert(Kind == RegexNodeKind.Concatenate, $"Expected Concatenate, got {Kind}"); 2855if (child.Kind is RegexNodeKind.One) 2868else if (child.Kind is RegexNodeKind.Multi) 2880else if (child.Kind is RegexNodeKind.Set || 2881(child.Kind is RegexNodeKind.Setloop or RegexNodeKind.Setlazy or RegexNodeKind.Setloopatomic && child.M == child.N)) 2890vsb.Append((char)(twoChars[0] | 0x20), child.Kind is RegexNodeKind.Set ? 1 : child.M); 2892else if (child.Kind is RegexNodeKind.Empty) 2943Debug.Assert(Kind == RegexNodeKind.Concatenate, $"Expected Concatenate, got {Kind}"); 2947RegexNodeKind.One or RegexNodeKind.Notone or RegexNodeKind.Set => true, 2948RegexNodeKind.Multi => true, 2949RegexNodeKind.Oneloop or RegexNodeKind.Onelazy or RegexNodeKind.Oneloopatomic or 2950RegexNodeKind.Notoneloop or RegexNodeKind.Notonelazy or RegexNodeKind.Notoneloopatomic or 2951RegexNodeKind.Setloop or RegexNodeKind.Setlazy or RegexNodeKind.Setloopatomic 2993return new RegexNode(RegexNodeKind.Empty, Options); 2999case <= MultiVsRepeaterLimit when Kind == RegexNodeKind.One: 3005Kind = RegexNodeKind.Multi; 3014case RegexNodeKind.One: 3015case RegexNodeKind.Notone: 3016case RegexNodeKind.Set: 3017MakeRep(lazy ? RegexNodeKind.Onelazy : RegexNodeKind.Oneloop, min, max); 3021var result = new RegexNode(lazy ? RegexNodeKind.Lazyloop : RegexNodeKind.Loop, Options, min, max); 3144public bool IsSetFamily => Kind is RegexNodeKind.Set or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic or RegexNodeKind.Setlazy; 3147public bool IsOneFamily => Kind is RegexNodeKind.One or RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic or RegexNodeKind.Onelazy; 3150public bool IsNotoneFamily => Kind is RegexNodeKind.Notone or RegexNodeKind.Notoneloop or RegexNodeKind.Notoneloopatomic or RegexNodeKind.Notonelazy; 3201case RegexNodeKind.Oneloop: 3202case RegexNodeKind.Oneloopatomic: 3203case RegexNodeKind.Notoneloop: 3204case RegexNodeKind.Notoneloopatomic: 3205case RegexNodeKind.Onelazy: 3206case RegexNodeKind.Notonelazy: 3207case RegexNodeKind.One: 3208case RegexNodeKind.Notone: 3211case RegexNodeKind.Capture: 3218case RegexNodeKind.Backreference: 3219case RegexNodeKind.BackreferenceConditional: 3222case RegexNodeKind.Multi: 3230case RegexNodeKind.Set: 3231case RegexNodeKind.Setloop: 3232case RegexNodeKind.Setloopatomic: 3233case RegexNodeKind.Setlazy: 3240case RegexNodeKind.Oneloop: 3241case RegexNodeKind.Oneloopatomic: 3242case RegexNodeKind.Notoneloop: 3243case RegexNodeKind.Notoneloopatomic: 3244case RegexNodeKind.Onelazy: 3245case RegexNodeKind.Notonelazy: 3246case RegexNodeKind.Setloop: 3247case RegexNodeKind.Setloopatomic: 3248case RegexNodeKind.Setlazy: 3249case RegexNodeKind.Loop: 3250case RegexNodeKind.Lazyloop:

277StartGroup(new RegexNode(RegexNodeKind.Capture, (_options & ~RegexOptions.IgnoreCase), 0, -1)); 347_unit = new RegexNode(RegexNodeKind.Set, _options & ~RegexOptions.IgnoreCase, setString); 394_unit = new RegexNode((_options & RegexOptions.Multiline) != 0 ? RegexNodeKind.Bol : RegexNodeKind.Beginning, _options); 398_unit = new RegexNode((_options & RegexOptions.Multiline) != 0 ? RegexNodeKind.Eol : RegexNodeKind.EndZ, _options); 403new RegexNode(RegexNodeKind.Set, _options & ~RegexOptions.IgnoreCase, RegexCharClass.AnyClass) : 404new RegexNode(RegexNodeKind.Notone, _options & ~RegexOptions.IgnoreCase, '\n'); 521_concatenation = new RegexNode(RegexNodeKind.Concatenate, _options); 759return new RegexNode(RegexNodeKind.Group, _options); 763return new RegexNode(RegexNodeKind.Capture, _options, _autocap++, -1); 776RegexNodeKind nodeType; 783nodeType = RegexNodeKind.Group; 789nodeType = RegexNodeKind.PositiveLookaround; 795nodeType = RegexNodeKind.NegativeLookaround; 800nodeType = RegexNodeKind.Atomic; 823nodeType = RegexNodeKind.PositiveLookaround; 834nodeType = RegexNodeKind.NegativeLookaround; 937return new RegexNode(RegexNodeKind.Capture, _options, capnum, uncapnum); 959return new RegexNode(RegexNodeKind.BackreferenceConditional, _options, capnum); 973return new RegexNode(RegexNodeKind.BackreferenceConditional, _options, tmpCapnum); 978nodeType = RegexNodeKind.ExpressionConditional; 1002nodeType = RegexNodeKind.Group; 1004if (_group!.Kind != RegexNodeKind.ExpressionConditional) 1096new RegexNode(RegexNodeKind.Set, (_options & ~RegexOptions.IgnoreCase), (_options & RegexOptions.ECMAScript) != 0 ? RegexCharClass.ECMAWordClass : RegexCharClass.WordClass); 1101new RegexNode(RegexNodeKind.Set, (_options & ~RegexOptions.IgnoreCase), (_options & RegexOptions.ECMAScript) != 0 ? RegexCharClass.NotECMAWordClass : RegexCharClass.NotWordClass); 1106new RegexNode(RegexNodeKind.Set, (_options & ~RegexOptions.IgnoreCase), (_options & RegexOptions.ECMAScript) != 0 ? RegexCharClass.ECMASpaceClass : RegexCharClass.SpaceClass); 1111new RegexNode(RegexNodeKind.Set, (_options & ~RegexOptions.IgnoreCase), (_options & RegexOptions.ECMAScript) != 0 ? RegexCharClass.NotECMASpaceClass : RegexCharClass.NotSpaceClass); 1116new RegexNode(RegexNodeKind.Set, (_options & ~RegexOptions.IgnoreCase), (_options & RegexOptions.ECMAScript) != 0 ? RegexCharClass.ECMADigitClass : RegexCharClass.DigitClass); 1121new RegexNode(RegexNodeKind.Set, (_options & ~RegexOptions.IgnoreCase), (_options & RegexOptions.ECMAScript) != 0 ? RegexCharClass.NotECMADigitClass : RegexCharClass.NotDigitClass); 1138return new RegexNode(RegexNodeKind.Set, (_options & ~RegexOptions.IgnoreCase), cc.ToStringClass()); 1142if (result != null && result.Kind == RegexNodeKind.Backreference && (result.Options & RegexOptions.IgnoreCase) != 0) 1203IsCaptureSlot(capnum) ? new RegexNode(RegexNodeKind.Backreference, _options, capnum) : 1235return scanOnly ? null : new RegexNode(RegexNodeKind.Backreference, _options, capnum); 1249return new RegexNode(RegexNodeKind.Backreference, _options, capnum); 1269_capnames?[capname] is int tmpCapnum ? new RegexNode(RegexNodeKind.Backreference, _options, tmpCapnum) : 1345return new RegexNode(RegexNodeKind.Backreference, _options, capnum); 1355return new RegexNode(RegexNodeKind.Backreference, _options, capnum); 1367return new RegexNode(RegexNodeKind.Backreference, _options, tmpCapnum); 1405return new RegexNode(RegexNodeKind.Backreference, _options, capnum); 1653private readonly RegexNodeKind TypeFromCode(char ch) => 1656'b' => (_options & RegexOptions.ECMAScript) != 0 ? RegexNodeKind.ECMABoundary : RegexNodeKind.Boundary, 1657'B' => (_options & RegexOptions.ECMAScript) != 0 ? RegexNodeKind.NonECMABoundary : RegexNodeKind.NonBoundary, 1658'A' => RegexNodeKind.Beginning, 1659'G' => RegexNodeKind.Start, 1660'Z' => RegexNodeKind.EndZ, 1661'z' => RegexNodeKind.End, 1662_ => RegexNodeKind.Nothing, 2004_concatenation!.AddChild(new RegexNode(RegexNodeKind.Multi, _options & ~RegexOptions.IgnoreCase, _pattern.Substring(pos, cch))); 2034if (_group.Kind == RegexNodeKind.ExpressionConditional && _group.ChildCount() == 0) 2050_alternation = new RegexNode(RegexNodeKind.Alternate, _options); 2051_concatenation = new RegexNode(RegexNodeKind.Concatenate, _options); 2059if (_group!.Kind is RegexNodeKind.ExpressionConditional or RegexNodeKind.BackreferenceConditional) 2068_concatenation = new RegexNode(RegexNodeKind.Concatenate, _options); 2074if (_group!.Kind is RegexNodeKind.ExpressionConditional or RegexNodeKind.BackreferenceConditional) 2078if (_group.Kind == RegexNodeKind.BackreferenceConditional && _group.ChildCount() > 2 || _group.ChildCount() > 3)

84case RegexNodeKind.Atomic: 85case RegexNodeKind.Capture: 90case RegexNodeKind.Bol: 91case RegexNodeKind.Eol: 92case RegexNodeKind.Boundary: 93case RegexNodeKind.ECMABoundary: 94case RegexNodeKind.NonBoundary: 95case RegexNodeKind.NonECMABoundary: 96case RegexNodeKind.Beginning: 97case RegexNodeKind.Start: 98case RegexNodeKind.EndZ: 99case RegexNodeKind.End: 100case RegexNodeKind.Empty: 101case RegexNodeKind.UpdateBumpalong: 102case RegexNodeKind.PositiveLookaround: 103case RegexNodeKind.NegativeLookaround: 112case RegexNodeKind.One or RegexNodeKind.Oneloop or RegexNodeKind.Onelazy or RegexNodeKind.Oneloopatomic when !ignoreCase || !RegexCharClass.ParticipatesInCaseConversion(node.Ch): 114int reps = node.Kind is RegexNodeKind.One ? 1 : Math.Min(node.M, MaxPrefixLength); 119return node.Kind is RegexNodeKind.One || reps == node.N; 124case RegexNodeKind.Multi: 156case RegexNodeKind.Set or RegexNodeKind.Setloop or RegexNodeKind.Setlazy or RegexNodeKind.Setloopatomic when !RegexCharClass.IsNegated(node.Str!): // negated sets are too complex to analyze 164int reps = node.Kind is RegexNodeKind.Set ? 1 : Math.Min(node.M, MaxPrefixLength); 209return node.Kind is RegexNodeKind.Set || reps == node.N; 212case RegexNodeKind.Concatenate: 226case RegexNodeKind.Loop or RegexNodeKind.Lazyloop when node.M > 0: 242case RegexNodeKind.Alternate: 363case RegexNodeKind.Concatenate: 377case RegexNodeKind.Alternate when !rtl: // for RTL we'd need to be matching the suffixes of the alternation cases 422case RegexNodeKind.One: 427case RegexNodeKind.Multi: 432case RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic or RegexNodeKind.Onelazy when node.M > 0: 439case RegexNodeKind.Loop or RegexNodeKind.Lazyloop when node.M > 0: 454case RegexNodeKind.Atomic: 455case RegexNodeKind.Capture: 459case RegexNodeKind.Bol: 460case RegexNodeKind.Eol: 461case RegexNodeKind.Boundary: 462case RegexNodeKind.ECMABoundary: 463case RegexNodeKind.NonBoundary: 464case RegexNodeKind.NonECMABoundary: 465case RegexNodeKind.Beginning: 466case RegexNodeKind.Start: 467case RegexNodeKind.EndZ: 468case RegexNodeKind.End: 469case RegexNodeKind.Empty: 470case RegexNodeKind.UpdateBumpalong: 471case RegexNodeKind.PositiveLookaround: 472case RegexNodeKind.NegativeLookaround: 491case RegexNodeKind.Atomic: 492case RegexNodeKind.Capture: 493case RegexNodeKind.Loop or RegexNodeKind.Lazyloop when node.M > 0: 497case RegexNodeKind.Concatenate: 600case RegexNodeKind.One: 609case RegexNodeKind.Onelazy or RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic when node.M > 0: 621case RegexNodeKind.Multi: 633case RegexNodeKind.Set: 641case RegexNodeKind.Setlazy or RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic when node.M > 0: 652case RegexNodeKind.Notone: 658case RegexNodeKind.Notonelazy or RegexNodeKind.Notoneloop or RegexNodeKind.Notoneloopatomic when node.M == node.N: 662case RegexNodeKind.Beginning: 663case RegexNodeKind.Bol: 664case RegexNodeKind.Boundary: 665case RegexNodeKind.ECMABoundary: 666case RegexNodeKind.Empty: 667case RegexNodeKind.End: 668case RegexNodeKind.EndZ: 669case RegexNodeKind.Eol: 670case RegexNodeKind.NonBoundary: 671case RegexNodeKind.NonECMABoundary: 672case RegexNodeKind.UpdateBumpalong: 673case RegexNodeKind.Start: 674case RegexNodeKind.NegativeLookaround: 675case RegexNodeKind.PositiveLookaround: 681case RegexNodeKind.Atomic: 682case RegexNodeKind.Group: 683case RegexNodeKind.Capture: 686case RegexNodeKind.Lazyloop or RegexNodeKind.Loop when node.M > 0: 696case RegexNodeKind.Concatenate: 709case RegexNodeKind.Alternate when thorough: 954case RegexNodeKind.One or RegexNodeKind.Oneloop or RegexNodeKind.Onelazy or RegexNodeKind.Oneloopatomic: 959return node.Kind is RegexNodeKind.One || node.M > 0 ? true : null; 963case RegexNodeKind.Notone or RegexNodeKind.Notoneloop or RegexNodeKind.Notoneloopatomic or RegexNodeKind.Notonelazy: 977return node.Kind is RegexNodeKind.Notone || node.M > 0 ? true : null; 981case RegexNodeKind.Set or RegexNodeKind.Setloop or RegexNodeKind.Setlazy or RegexNodeKind.Setloopatomic: 996node.Kind is RegexNodeKind.Set || node.M > 0 ? true : 1000case RegexNodeKind.Multi: 1012case RegexNodeKind.Empty: 1013case RegexNodeKind.Nothing: 1014case RegexNodeKind.Bol: 1015case RegexNodeKind.Eol: 1016case RegexNodeKind.Boundary: 1017case RegexNodeKind.NonBoundary: 1018case RegexNodeKind.ECMABoundary: 1019case RegexNodeKind.NonECMABoundary: 1020case RegexNodeKind.Beginning: 1021case RegexNodeKind.Start: 1022case RegexNodeKind.EndZ: 1023case RegexNodeKind.End: 1024case RegexNodeKind.UpdateBumpalong: 1025case RegexNodeKind.PositiveLookaround: 1026case RegexNodeKind.NegativeLookaround: 1030case RegexNodeKind.Atomic: 1031case RegexNodeKind.Capture: 1037case RegexNodeKind.Loop: 1038case RegexNodeKind.Lazyloop: 1050case RegexNodeKind.Concatenate: 1081case RegexNodeKind.Alternate: 1102case RegexNodeKind.BackreferenceConditional: 1103case RegexNodeKind.ExpressionConditional: 1104int branchStart = node.Kind is RegexNodeKind.BackreferenceConditional ? 0 : 1; 1113case RegexNodeKind.Backreference: 1138while (node.Kind is RegexNodeKind.Atomic or RegexNodeKind.Capture) 1142if (node.Kind != RegexNodeKind.Concatenate) 1155while (firstChild.Kind is RegexNodeKind.Atomic or RegexNodeKind.Capture) 1159if (firstChild.Kind is not (RegexNodeKind.Setloop or RegexNodeKind.Setloopatomic or RegexNodeKind.Setlazy) || firstChild.N != int.MaxValue) 1167if (nextChild.Kind == RegexNodeKind.UpdateBumpalong) 1224while ((nextChild.Kind is RegexNodeKind.Atomic or RegexNodeKind.Capture or RegexNodeKind.Concatenate) || 1225(nextChild.Kind is RegexNodeKind.Loop or RegexNodeKind.Lazyloop && nextChild.M >= 1)) 1233(nextChild.Kind is RegexNodeKind.Set || nextChild.M >= 1)) 1279case RegexNodeKind.PositiveLookaround: 1284case RegexNodeKind.Bol: 1285case RegexNodeKind.Eol: 1286case RegexNodeKind.Beginning: 1287case RegexNodeKind.Start: 1288case RegexNodeKind.EndZ: 1289case RegexNodeKind.End: 1290case RegexNodeKind.Boundary: 1291case RegexNodeKind.ECMABoundary: 1292case RegexNodeKind.NegativeLookaround: 1293case RegexNodeKind.Empty: 1297case RegexNodeKind.Atomic: 1298case RegexNodeKind.Capture: 1303case RegexNodeKind.Loop or RegexNodeKind.Lazyloop when node.M >= 1: 1309case RegexNodeKind.Concatenate: 1330public static RegexNodeKind FindLeadingAnchor(RegexNode node) => 1334public static RegexNodeKind FindTrailingAnchor(RegexNode node) => 1338private static RegexNodeKind FindLeadingOrTrailingAnchor(RegexNode node, bool leading) 1344return RegexNodeKind.Unknown; 1351case RegexNodeKind.Bol: 1352case RegexNodeKind.Eol: 1353case RegexNodeKind.Beginning: 1354case RegexNodeKind.Start: 1355case RegexNodeKind.EndZ: 1356case RegexNodeKind.End: 1360case RegexNodeKind.Atomic: 1361case RegexNodeKind.Capture: 1362case RegexNodeKind.Loop or RegexNodeKind.Lazyloop when leading && node.M >= 1: 1363case RegexNodeKind.PositiveLookaround when leading && (node.Options & RegexOptions.RightToLeft) == 0: 1373case RegexNodeKind.Concatenate: 1380RegexNodeKind bestAnchorFound = RegexNodeKind.Unknown; 1388case RegexNodeKind.Empty or RegexNodeKind.NegativeLookaround: 1389case RegexNodeKind.PositiveLookaround when ((node.Options | tmpChild.Options) & RegexOptions.RightToLeft) != 0: 1390case RegexNodeKind.Boundary or RegexNodeKind.ECMABoundary or RegexNodeKind.NonBoundary or RegexNodeKind.NonECMABoundary: 1394case RegexNodeKind.PositiveLookaround: 1416if (node.Child(i).Kind is not (RegexNodeKind.Empty or RegexNodeKind.PositiveLookaround or RegexNodeKind.NegativeLookaround)) 1424if (bestAnchorFound is not RegexNodeKind.Unknown) 1446static RegexNodeKind ChooseBetterAnchor(RegexNodeKind anchor1, RegexNodeKind anchor2) 1449anchor1 == RegexNodeKind.Unknown ? anchor2 : 1450anchor2 == RegexNodeKind.Unknown ? anchor1 : 1454static int RankAnchorQuality(RegexNodeKind node) => 1457RegexNodeKind.Beginning => 3, 1458RegexNodeKind.Start => 3, 1459RegexNodeKind.End => 3, 1460RegexNodeKind.EndZ => 3, 1462RegexNodeKind.Bol => 2, 1463RegexNodeKind.Eol => 2, 1465RegexNodeKind.Boundary => 1, 1466RegexNodeKind.ECMABoundary => 1, 1472static bool IsBestAnchor(RegexNodeKind anchor) => 1474anchor is RegexNodeKind.Beginning or RegexNodeKind.Start or RegexNodeKind.End or RegexNodeKind.EndZ; 1477case RegexNodeKind.Alternate: 1481RegexNodeKind anchor = FindLeadingOrTrailingAnchor(node.Child(0), leading); 1482if (anchor == RegexNodeKind.Unknown) 1484return RegexNodeKind.Unknown; 1494return RegexNodeKind.Unknown; 1504return RegexNodeKind.Unknown;

36Debug.Assert(concat.Kind == RegexNodeKind.Concatenate, $"Expected Concatenate, got {concat.Kind}"); 50case RegexNodeKind.Multi: 54case RegexNodeKind.One: 58case RegexNodeKind.Backreference:

49case RegexNodeKind.Alternate: 50case RegexNodeKind.Loop or RegexNodeKind.Lazyloop when node.M != node.N: 51case RegexNodeKind.Oneloop or RegexNodeKind.Notoneloop or RegexNodeKind.Setloop or RegexNodeKind.Onelazy or RegexNodeKind.Notonelazy or RegexNodeKind.Setlazy when node.M != node.N: 63case RegexNodeKind.Atomic: 64case RegexNodeKind.NegativeLookaround: 65case RegexNodeKind.PositiveLookaround: 70case RegexNodeKind.Capture: 75case RegexNodeKind.Loop: 76case RegexNodeKind.Lazyloop: 94RegexNodeKind.Atomic or RegexNodeKind.NegativeLookaround or RegexNodeKind.PositiveLookaround => true, 98RegexNodeKind.Alternate or RegexNodeKind.BackreferenceConditional or RegexNodeKind.ExpressionConditional => true, 101RegexNodeKind.Capture => true, 105RegexNodeKind.Concatenate => i == childCount - 1, 111RegexNodeKind.Loop or RegexNodeKind.Lazyloop when node.N == 1 => true,

14private const RegexNodeKind BeforeChild = (RegexNodeKind)64; 15private const RegexNodeKind AfterChild = (RegexNodeKind)128; 201private void EmitFragment(RegexNodeKind nodeType, RegexNode node, int curIndex) 215case RegexNodeKind.Concatenate | BeforeChild: 216case RegexNodeKind.Concatenate | AfterChild: 217case RegexNodeKind.Empty: 220case RegexNodeKind.Alternate | BeforeChild: 228case RegexNodeKind.Alternate | AfterChild: 247case RegexNodeKind.BackreferenceConditional | BeforeChild: 260case RegexNodeKind.BackreferenceConditional | AfterChild: 278case RegexNodeKind.ExpressionConditional | BeforeChild: 290case RegexNodeKind.ExpressionConditional | AfterChild: 311case RegexNodeKind.Loop | BeforeChild: 312case RegexNodeKind.Lazyloop | BeforeChild: 327case RegexNodeKind.Loop | AfterChild: 328case RegexNodeKind.Lazyloop | AfterChild: 331int Lazy = (nodeType - (RegexNodeKind.Loop | AfterChild)); 343case RegexNodeKind.Capture | BeforeChild: 347case RegexNodeKind.Capture | AfterChild: 351case RegexNodeKind.PositiveLookaround | BeforeChild: 356case RegexNodeKind.PositiveLookaround | AfterChild: 361case RegexNodeKind.NegativeLookaround | BeforeChild: 367case RegexNodeKind.NegativeLookaround | AfterChild: 373case RegexNodeKind.Atomic | BeforeChild: 377case RegexNodeKind.Atomic | AfterChild: 381case RegexNodeKind.One: 382case RegexNodeKind.Notone: 386case RegexNodeKind.Notoneloop: 387case RegexNodeKind.Notoneloopatomic: 388case RegexNodeKind.Notonelazy: 389case RegexNodeKind.Oneloop: 390case RegexNodeKind.Oneloopatomic: 391case RegexNodeKind.Onelazy: 394Emit(((node.Kind is RegexNodeKind.Oneloop or RegexNodeKind.Oneloopatomic or RegexNodeKind.Onelazy) ? 403case RegexNodeKind.Setloop: 404case RegexNodeKind.Setloopatomic: 405case RegexNodeKind.Setlazy: 419case RegexNodeKind.Multi: 423case RegexNodeKind.Set: 427case RegexNodeKind.Backreference: 431case RegexNodeKind.Nothing: 432case RegexNodeKind.Bol: 433case RegexNodeKind.Eol: 434case RegexNodeKind.Boundary: 435case RegexNodeKind.NonBoundary: 436case RegexNodeKind.ECMABoundary: 437case RegexNodeKind.NonECMABoundary: 438case RegexNodeKind.Beginning: 439case RegexNodeKind.Start: 440case RegexNodeKind.EndZ: 441case RegexNodeKind.End: 442case RegexNodeKind.UpdateBumpalong:

57case RegexNodeKind.One: 61case RegexNodeKind.Notone: 65case RegexNodeKind.Set: 69case RegexNodeKind.Multi: 84case RegexNodeKind.Concatenate: 85case RegexNodeKind.Alternate: 86case RegexNodeKind.Loop: 87case RegexNodeKind.Lazyloop: 88case RegexNodeKind.Capture when node.N == -1: // N == -1 because balancing groups (which have N >= 0) aren't supported 106case RegexNodeKind.Oneloop: 107case RegexNodeKind.Onelazy: 108case RegexNodeKind.Notoneloop: 109case RegexNodeKind.Notonelazy: 117result.AddLast(_builder.CreateLoop(_builder.CreateSingleton(bdd), node.Kind is RegexNodeKind.Onelazy or RegexNodeKind.Notonelazy, node.M, node.N)); 121case RegexNodeKind.Setloop: 122case RegexNodeKind.Setlazy: 128result.AddLast(_builder.CreateLoop(_builder.CreateSingleton(setBdd), node.Kind == RegexNodeKind.Setlazy, node.M, node.N)); 132case RegexNodeKind.Empty: 133case RegexNodeKind.UpdateBumpalong: // UpdateBumpalong is a directive relevant only to backtracking and can be ignored just like Empty 136case RegexNodeKind.Nothing: 142case RegexNodeKind.Beginning: 146case RegexNodeKind.Bol: 151case RegexNodeKind.End: // \z anchor 155case RegexNodeKind.EndZ: // \Z anchor 160case RegexNodeKind.Eol: 165case RegexNodeKind.Boundary: 170case RegexNodeKind.NonBoundary: 180RegexNodeKind.Atomic or RegexNodeKind.Setloopatomic or RegexNodeKind.Oneloopatomic or RegexNodeKind.Notoneloopatomic => SR.ExpressionDescription_AtomicSubexpressions, 181RegexNodeKind.Backreference => SR.ExpressionDescription_Backreference, 182RegexNodeKind.BackreferenceConditional => SR.ExpressionDescription_Conditional, 183RegexNodeKind.Capture => SR.ExpressionDescription_BalancingGroup, 184RegexNodeKind.ExpressionConditional => SR.ExpressionDescription_IfThenElse, 185RegexNodeKind.NegativeLookaround => SR.ExpressionDescription_NegativeLookaround, 186RegexNodeKind.PositiveLookaround => SR.ExpressionDescription_PositiveLookaround, 187RegexNodeKind.Start => SR.ExpressionDescription_ContiguousMatches, 195string description = $"Unexpected ({nameof(RegexNodeKind)}: {node.Kind})"; 211case RegexNodeKind.Concatenate: 221case RegexNodeKind.Alternate: 250case RegexNodeKind.Loop: 251case RegexNodeKind.Lazyloop: 260result.AddLast(_builder.CreateLoop(body, node.Kind == RegexNodeKind.Lazyloop, node.M, node.N)); 267Debug.Assert(node.Kind == RegexNodeKind.Capture && node.N == -1); 285Debug.Assert(rootResult.Count == 1 || root.Kind == RegexNodeKind.Concatenate || root.Kind == RegexNodeKind.Capture); 312Debug.Assert(node.Kind == RegexNodeKind.Set);

9/// <summary>An empty node that matches a zero-width input (e.g. <see cref="RegexNodeKind.Empty"/>).</summary> 11/// <summary>A node that matches a single character (i.e. <see cref="RegexNodeKind.One"/>, <see cref="RegexNodeKind.Notone"/>, or <see cref="RegexNodeKind.Set"/>).</summary> 13/// <summary>A node that matches a sequence of nodes (i.e. <see cref="RegexNodeKind.Concatenate"/>).</summary> 15/// <summary>A node that matches a loop (e.g. <see cref="RegexNodeKind.Loop"/>, <see cref="RegexNodeKind.Lazyloop"/>, <see cref="RegexNodeKind.Setloop"/>, etc.).</summary> 17/// <summary>A node that matches if any of its nodes match and that matches them in a fixed order that mirrors how the backtracking engines operate (e.g. <see cref="RegexNodeKind.Alternate"/>).</summary> 20/// <summary>A node that represents a beginning anchor (i.e. <see cref="RegexNodeKind.Beginning"/>).</summary> 22/// <summary>A node that represents an ending anchor (i.e. <see cref="RegexNodeKind.End"/>).</summary> 24/// <summary>A node that represents an ending \Z anchor (i.e. <see cref="RegexNodeKind.EndZ"/>).</summary> 28/// <summary>A node that represents a beginning-of-line anchor (i.e. <see cref="RegexNodeKind.Bol"/>).</summary> 30/// <summary>A node that represents a end-of-line anchor (i.e. <see cref="RegexNodeKind.Eol"/>).</summary> 32/// <summary>A node that represents a word boundary anchor (i.e. <see cref="RegexNodeKind.Boundary"/>).</summary> 34/// <summary>A node that represents a word non-boundary anchor (i.e. <see cref="RegexNodeKind.NonBoundary"/>).</summary>

211findOptimizations.LeadingAnchor is not RegexNodeKind.Beginning)