Matthew Barnett <[EMAIL PROTECTED]> added the comment:

Perl (?number) for calling numbered groups and (?&name) for named groups
 (Perl also supports (?P>name)). (?R) is equivalent to (?0).

It's interesting that the documentation for both Perl and PCRE say that
they support (?P>name) because that's what Python uses!

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Python tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue694374>
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