((an)|(in)|(on))

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using System;
using System.Text.RegularExpressions;

public class MainClass {
public static void Main() {

Regex p = new Regex(“((an)|(in)|(on))”);
MatchCollection mn = p.Matches(“King, Kong Kang”);
for (int i = 0; i < mn.Count; i++) { Console.WriteLine("Found '{0}' at position {1}",mn[i].Value, mn[i].Index); } } } [/csharp]