Eh, what's up doc?

Here's a pattern that should match http://regexlib.com/REDetails.aspx?regexp_id=564

This question has come up before in the last few years.  In fact I'm pretty sure Sergei came up with an alternate solution to my version that in this forum somewhere.

The only issue is the regex grows very fast for each new letter you add 

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Michael

"In theory, theory and practice are the same. In practice, they are not."
Albert Einstein