enum System.Text.RegularExpressions.RegexOptions flags:

   def enum
      None = 0
      IgnoreCase = 1
      Multiline = 2
      ExplicitCapture = 4
      Compiled = 8
      Singleline = 16
      IgnorePatternWhitespace = 32
      RightToLeft = 64
      ECMAScript = 256
      CultureInvariant = 512.

end enum.
