C++ IHTMLTxtRange regular expression question

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I am new to the IHTMLTxtRange interface. I am trying to locate and highlight phone numbers in a web page so I can link them. If IHTMLTxtRange supports regular expressions, I could easily use it to locate things that look like phone numbers and link them. If it doesn't, what is the best way to search a web page for a text pattern.

Thanks in advance,
Brian

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