Tim Peters added the comment:

Matthew, yes, PyPy's regex module implements regular expressions of the 
"computer science" (as opposed to POSIX) sense.  See Friedl's book for a full 
explanation.  Short course is that regex's flavor of regexp matching is 
linear-time, but cannot support "advanced" features like backreferences.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15515>
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