Regex to match a string after colon

Question

Input string is something like this: OU=TEST:This001. We need extra \"This001\". Best in C#.

Answer 1

A solution without regex:

var str = "OU=TEST:This00:1";
var result = str.Split(new char[] { ':' }, 2)[1];

// result == This00:1

Regex vs Split vs IndexOf

Split

var str = "OU=TEST:This00:1";

var sw = new Stopwatch();

sw.Start();
var result = str.Split(new char[] { ':' }, 2)[1];
sw.Stop();

// sw.ElapsedTicks == 15

Regex

var str = "OU=TEST:This00:1";

var sw = new Stopwatch();

sw.Start();
var result = (new Regex(":(.*)", RegexOptions.Compiled)).Match(str).Groups[1];
sw.Stop();

// sw.ElapsedTicks == 7000 (Compiled)

IndexOf

var str = "OU=TEST:This00:1";

var sw = new Stopwatch();

sw.Start();
var result = str.Substring(str.IndexOf(":") + 1);
sw.Stop();

// sw.ElapsedTicks == 40

Winner: Split

Links

• Split
• IndexOf
• Regex