Anyone know how to get a RichTextBox to do a RegulatExpression search?

If I search for tommatchpattern I find things like:

STDMETHODIMP FindTextEnd( BSTR bstr,
long Count,
long Flags,
long *pLength
);
Parameters
--snip--
Flags
Flags governing comparisons.
It can be zero (the default) or any combination of the following values.
tomMatchWord 2 Matches whole words.
tomMatchCase 4 Matches case.
tomMatchPattern 8 Matches regular expressions.


--snip--

But if I try it does not work.

Appreciate any help