> To add to what scott said, two advices:
> 1. Use Kodos, it's a RE debugger and an extremely fine tool to generate 
> your regular expressions.

Ok, just found this.  Will be helpful.

> 2. Read the module's documentation. Several time. In your case read the 
> "negative lookbehind assertion" part "(?<! ... )" several time, until 
> you understand how it may be of use to you.

Quite a teacher.  I'll read it several times...

Thanks anyway.
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