Question

I need to select only the bold text in a RichTextBox in a winform application and then enclose it within brackets :
For example: The Rollup Action element describes the desired action that should be applied to the cluster activity that defines the Rollup Rule.
The bold text would become:
[Rollup Action] [Rollup Rule]. Thanks.

Answer 1

One solution would be to use Regex to find the bold text and replace it with the same thing but with brackets added:

  richTextBox.Rtf = Regex.Replace(richTextBox.Rtf, @"\\b ((\w| )*)", RegExSample.AddBrackets);

And the MatchEvaluator:

public class RegExSample
{
      public static string AddBrackets(Match match)
      {
           return String.Format("[{0}]", match.Value);
      }
}

The output for your sample would be:

The [Rollup Action] element describes
the desired action that should be
applied to the cluster activity that
defines the [Rollup Rule]

You can also update the regex to be sure it works ok in all cases.