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Anyone interested in what structural regular expressions are and how they're superior to ordinary regular expressions is encouraged to read:

http://doc.cat-v.org/bell_labs/structural_regexps/se.pdf

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After glancing through this document, I'm still not sure what they are. The document seems to describe a use of regular expression rather than a new form of regular expression. Am I mistaken?

This was a better explanation for me: http://www.perlmonks.org/?node_id=665719

I'd only seen Rob Pike's stuff before so thanks for sharing this!

Thanks for that reminder. I've been using Acme for years, but I never figured out SREs.

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