[RESOLVED][3.0/LINQ] How to get word in RTB that mouse is over

What I am trying to do is find the word that I hover the mouse over and rest it against a list of keywords. I've googled around trying to find some information on how to do this but have only come up with some examples done in VB 6 that I have failed to try and do in C#. Can anyone help me out iwth this?

I managed to sort it on my own. Here is an example of what I was looking for.

Code:

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            richTextBox1.AppendText("This is a test word program!\n");
            richTextBox1.AppendText("Hello there, how are you?\n");
            richTextBox1.AppendText("Stop! Hammer time.");
           
            label1.Text = "";
            richTextBox1.MouseMove += new MouseEventHandler(richTextBox1_MouseMove);
        }

        void richTextBox1_MouseMove(object sender, MouseEventArgs e)
        {
            int pos = richTextBox1.GetCharIndexFromPosition(new Point(e.X, e.Y));
            int l = richTextBox1.Text.Length;
            if (l < 1)
                label1.Text = "";
            else
            {
                int s;
                int end;
                string c = string.Empty;
                c = richTextBox1.Text.Substring(pos, 1);
                Regex r = new Regex(@"[\s,\n,!,\,,\\,\/,\.,\?,:,;,`,~,\-,]");
                if (r.IsMatch(c))
                    label1.Text = "";
                else
                {
                    for (s = pos; s > 0; --s)
                    {
                        c = richTextBox1.Text.Substring(s, 1);
                        if (r.IsMatch(c))
                        {
                            s++;
                            break;
                        }
                    }

                    for (end = pos; end < l; end++)
                    {
                        c = richTextBox1.Text.Substring(end, 1);
                        if (r.IsMatch(c))
                            break;
                    }

                    if ((end - s) > 0)
                    {
                        c = richTextBox1.Text.Substring(s, end - s);
                        label1.Text = "\"" + c + "\"";
                    }
                    else
                        label1.Text = "";
                }
            }
        }
    }
}

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The regex pattern isn't perfect for pulling out words, I know. I also notice that if the rtb is multiline and if I click under a word where there is a blank space it will return the word above rather than no value. Any serious comments or suggestions welcome.