System\Text\RegularExpressions\Regex.Match.cs (3)
214return RunSingleMatch(RegexRunnerMode.ExistenceRequired, -1, input, 0, input.Length, RightToLeft ? input.Length : 0) is null;
250return RunSingleMatch(RegexRunnerMode.ExistenceRequired, -1, input, 0, input.Length, startat) is null;
276RunSingleMatch(RegexRunnerMode.ExistenceRequired, -1, input, startat).Success;