public void ReplaceText()
{
Regex regex = GetRegEx(TextToFind);
string input = editor.Text.Substring(editor.SelectionStart, editor.SelectionLength);
Match match = regex.Match(input);
bool replaced = false;
if (match.Success && match.Index == 0 && match.Length == input.Length)
{
editor.DocumentReplace(editor.SelectionStart, editor.SelectionLength, TextToReplace);
replaced = true;
}
if (!FindNextInternal() && !replaced)
{
SystemSounds.Beep.Play();
}
}