Use | to combine different case

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using System;
using System.Text.RegularExpressions;

class RXOptionsApp {
static void Main(string[] args) {
Regex r = new Regex(“in|In|IN|iN”);
string s = “The KING Was In His Counting House”;
MatchCollection mc = r.Matches(s);
for (int i = 0; i < mc.Count; i++) { Console.WriteLine("Found '{0}' at position {1}",mc[i].Value, mc[i].Index); } } } [/csharp]