Returning only part of match from Regular Expression

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I like to use named groups:

Match m = Regex.Match("User Name:first.sur", @"User Name:(?<name>\w+\.\w+)");
if(m.Success)
{
   string name = m.Groups["name"].Value;
}

Putting the ?<something> at the beginning of a group in parentheses (e.g. (?<something>...)) allows you to get the value from the match using something as a key (e.g. from m.Groups["something"].Value)

If you didn’t want to go to the trouble of naming your groups, you could say

Match m = Regex.Match("User Name:first.sur", @"User Name:(\w+\.\w+)");
if(m.Success)
{
   string name = m.Groups[1].Value;
}

and just get the first thing that matches. (Note that the first parenthesized group is at index 1; the whole expression that matches is at index 0)

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