The question http:Q_27777566.html
(Should I first learn Perl or Python?) led to discussion on regular expressions in Perl an Python. Purpose of this question is to summarize up-to-date information on the subject. If you are expert in Python and/or Perl, please suggest/write the benchmarks and help to collect the references related to the subject.
Let the http://stuffivelearned.org/doku.php?id=programming:general:phpvspythonvsperl
be the starter (but it is rather obsolete).