using System;

using System.Collections.Generic;

using System.Text;

using System.Text.RegularExpressions;

namespace DEMO

{

    class Darrenstring

    {

        public class Matchpattern:Darrenstring

        {

            private string text;

            private string pattern;

            private int index;

            public bool ismatch;

            public Matchpattern(string Text, string Pattern)

            {

                text = Text;

                pattern = Pattern;

                Match a = Regex.Match(text,pattern);

                index=a.Index;

                ismatch = a.Success;

            }

            public int Index()

            {

                return index;

            }

            public string Before()

            {

                if (ismatch)

                {

                    return (text.Substring(, index));

                }

                else return null;

            }

            public string After()

            {

                if (ismatch)

                {

                    return (text.Substring(index + pattern.Length, text.Length - pattern.Length-index));

                }

                else return null;

            }

        }

    }

}

 private void Confirm_Click(object sender, EventArgs e)

        {

            Darrenstring.Matchpattern A = new Darrenstring.Matchpattern(Source.Text, Terminal.Text);

            //Terminal.Text = Convert.ToString(A.Index());

            before1.Text = A.Before();

            After.Text = A.After();

            IsMatched.Checked = A.ismatch;

        }