private void AppendOptionsChars(RegexOptions options)
{
if ((options & RegexOptions.IgnoreCase) != 0)
AppendDirect('i');
if ((options & RegexOptions.Multiline) != 0)
AppendDirect('m');
if ((options & RegexOptions.ExplicitCapture) != 0)
AppendDirect('n');
if ((options & RegexOptions.Singleline) != 0)
AppendDirect('s');
if ((options & RegexOptions.IgnorePatternWhitespace) != 0)
AppendDirect('x');
}