From: "Albert Wagner" <alwagner / tcac.net>
>
> Cool!  That really works.  Thanks, Bill.  
> All I have available at the moment is the pickaxe book.  The only mention of 
> a use for  "?" in Chpt 5 is as a repetition modifier.   I just found the 
> extensions in Chpt 18.  But, seriously, I don't think I could have figured 
> out a use for them without an example.  Thanks again.

You're most welcome.  Yeah those zero-width positive/negative 
lookahead assertions are wonderfully capable bits of regexp
specificity.  Highly recommended.  =-)

Bill