C# - is it possible to check which optional regex group is matched?

Question

I wrote a simple regex to accept both local file paths ( C:\\some\\path\\to\\file ) and network locations ( \\\\0.0.0.0\\some\\path\\to\\file ). I have captured C:\\ and \\\\0.0.0.0\\ in separate named groups, <drive> and <netloc> accordingly.

Is it possible in C# to check which group is matched after a "global" match is found? I would like to set flags whether the directory given is local or network. To separate my groups I use the | character.

I've found similiar questions, but they do not cover C# and certainly are not easily "transferable".

Answer 1

Yes, the Groups also have a Success property.

Regex rx=new Regex(@"^((?<drive>[a-z]:\\.*)|(?<netloc>\\\\[^\\]+\\.*))$",
    RegexOptions.IgnoreCase|RegexOptions.CultureInvariant|RegexOptions.ExplicitCapture);
Match match = rx.Match(somePath);
if (match.Groups["drive"].Success) {
    // drive match
} else if (match.Groups["netloc"].Success) {
    // netloc match
} else {
    // none of these groups matched
}

See MSDN for more info.