Regex.replace match and replace and show a message

See more:

C#

Visual-Studio

Hello All,
I have a project with this code:

Dictionary<string, string> map = new Dictionary<string, string>();
map.Add("FB", "facebook");
map.Add("gg", "Google");

etc etc

and in textbox1.text changed

<pre>
            se += textbox1.text;

            string temp = se;
            foreach (var entry in map)
            {
                    char[] result = value.ToCharArray();
                    return new string(result);
                }, RegexOptions.Compiled);
            }
            textBox1.Text = temp;

it is full code of my program.
When i type in textbox1.text= hellofb it instant replaced to hellofacebook

but i want :
when i type - hellofb it works. it replaced to : hellofacebook in textbox. Works fine.
but but i want before replace "fb" or "gg" or etc (dictionary mapped)i want it show me a message with it's position(from textbox) and it's length.

What I have tried:

For use of foreach : i did this :

private string CharStore;
private string SeqLenth;
private string ReleaseNew;
string ReleaseCMD;

string temp = textbox1.Text;
foreach (var entry in map)
{
    string key = entry.Key;
    string value = entry.Value;
    temp = Regex.Replace(temp, key, match =>
    {

        SeqLenth = key.Length.ToString();
        ReleaseCMD = "1";
        char[] result = value.ToCharArray();
        return new string(result);
    }, RegexOptions.Compiled);
}
//textBox1.Text = temp;


if (ReleaseCMD == "1")
{
    MessageBox.Show("Done","Successfully Replaced");
    ReleaseNew= string.Empty;
    ReleaseCMD = string.Empty;
    CharStore = string.Empty;

}
else
{

  ///Nothing.

}

Now -

I need finally -

i want before replace "fb" or "gg" or etc (dictionary mapped)i want it show me a message with it's position(from textbox) and it's length.