Higlight matched word

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ASP.NET

Hi All,
I am creating IE BHO, and the functionality of the BHO is to highlight the matched words, everyting is running fine, except i issue. My problem is i have a word "DON" and on the IE browser there is word "Don't". i want to ignore word "don't" from highlighting, but it part of don't i.e. don get highlight.

I have use the below function to ignore the words

if (Regex.IsMatch(PageText, string.Format(@"\b({0})\b", TextToHighlights)))
                        {
                            
                            lst.Add(TextToHighlights);
                        }

In Pagetext, we have all the words from browser
and

TextToHighlights: in this we send words 1 by 1 to match in loop


Please help me to solve this issue.


Thanks
AP