.NET/C# Regular Expressions

Can't live without it! You know you can't! I know I can't!

C# Example Code

using System.Text.RegularExpressions;

Regex KGIDregex = new Regex(@"!KGID!([0-9]{10})!KGID!");

string TargetString = "!KGID!1111111111!KGID!dasdasdassadas";

Match KGIDmatch = KGIDregex.Match(TargetString);

if (KGIDmatch.Success) {
	// KGIDmatch.Value = The whole matched string.
	// KGIDmatch.Groups[1].Value = Contents within parentheses. (Index starts on 1, NOT zero).
} else {
	// Boo!
}

Regex-based replacement

string what = "Nilsen's Eventyr på Snøen.mkv";
string pattern = "[^a-zA-Z0-9]";
string with = "";

// Replace (in this case remove) everything that's not alphanumeric.
// Useful for e.g. generating filenames or identifier strings of sorts.
Regex.replace(what,pattern,with);

Couple o' Extra Resources:
Regular Expression Language - Quick Reference (MSDN)
C# Regular Expressions Cheat Sheet - Mikesdotnetting
Regex Cheat Sheet - Regular Expression Library