Ian Bicking: the old part of his blog

Ofsyntaxandenvironment comment 000

I thought Python regular expressions were Perl-compatible in syntax, and somewhere I guess I got the impression they used the PCRE backend, though I might have entirely imagined that. At least I thought the distinction between re and regex was that regex used Emacs-style regular expressions, and re used Perl-style.

But I'm not saying I'm right or anything.

Comment on Re: Of Syntax and Environment
by Ian Bicking

Comments:

source
In 1.5.2, the RE module used PCRE.  In 1.6 and later, that was
replaced with a Unicode-aware engine, SRE, which was written from
scratch, using on the 1.5.2 documentation and test suite as the
specification.

(guess who wrote it? ;-)
# Fredrik

source
should have been "using only the"
# Fredrik