How to highlight a word using REGEX

Question

I need to colorize a text in Richtextbox before a string For example:

"Highlight: normal highlight"

Answer 1

See if this can help you

private void ColourRrbText(RichTextBox rtb)
    {
        Regex regExp = new Regex("^([^:]*)");

        foreach (Match match in regExp.Matches(rtb.Text))
        {
            rtb.Select(match.Index, match.Length);
            rtb.SelectionColor = Color.Blue;
        }
    }