When dealing with regular expressions, my approach is to do the simplest thing that works.

In your case, this means looking for three capital letters, following by some stuff, and then a two or three digit number, a dash, and the same two or three digit number.

So the regexp I'd use would be 

/([A-Z]{3}).+(\d{2,3})-\2/

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This makes the assumption that the two numbers at the end are the same. If they might be different, you'd have to change the second capture to something like 
/([A-Z]{3}).+(\d{2,3}-\d{2,3})/

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When in doubt, try the simplest thing that could work. You're putting 'Protocol' and other stuff in there -- throw it away -- you don't need it. :)

Alex / talexb / Toronto

"Groklaw is the open-source mentality applied to legal research" ~ Linus Torvalds

In reply to Re: Regex Question by talexb
in thread Regex Question by clegane

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