using System;
using System.Text.RegularExpressions;

public class MainClass {
public static void Main() {

Regex n = new Regex(“Gr(a|e)y”);
MatchCollection mp = n.Matches(“Green, Grey, Granite, Gray”);
for (int i = 0; i < mp.Count; i++) { Console.WriteLine("Found '{0}' at position {1}",mp[i].Value, mp[i].Index); } } } [/csharp]

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]

using System;
using System.Text.RegularExpressions;

public class MainClass {
public static void Main() {

Regex q = new Regex(” in “);
MatchCollection mm = q.Matches(“IN at in or”);
for (int i = 0; i < mm.Count; i++) { Console.WriteLine("Found '{0}' at position {1}",mm[i].Value, mm[i].Index); } } } [/csharp]

   
 
using System;
using System.Text.RegularExpressions;


class MatchingApp {
    static void Main(string[] args) {
        Regex r = new Regex("in");
        Match m = r.Match("Matching");
        if (m.Success) {
            Console.WriteLine("Found '{0}' at position {1}",m.Value, m.Index);
        }
    }
}

    

   
 

using System;
using System.Text.RegularExpressions;


public class MainClass {
    public static void Main() {
        string x = "Once Upon A Time In America";
        Regex m = new Regex("( )");
        foreach (string ss in m.Split(x)) {
            Console.WriteLine(ss);
        }
    }
}

    

   
 

using System;
using System.Text.RegularExpressions;


public class MainClass {
    public static void Main() {
        string x = "Once Upon A Time In America";
        Regex m = new Regex("( )");
        foreach (string ss in m.Split(x)) {
            Console.WriteLine(ss);
        }
    }
}

    

   
 

using System;
using System.Text.RegularExpressions;


public class MainClass {
    public static void Main() {
        string v = "Once   Upon A Time In   America";
        Regex o = new Regex(@"[s]+");
        foreach (string ss in o.Split(v)) {
            Console.WriteLine(ss);
        }
    }
}