[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Chicken-users] regex and named subpatterns
From: |
Robin Lee Powell |
Subject: |
Re: [Chicken-users] regex and named subpatterns |
Date: |
Wed, 5 Mar 2008 17:49:10 -0800 |
User-agent: |
Mutt/1.5.17+20080114 (2008-01-14) |
On Wed, Mar 05, 2008 at 08:42:23PM -0500, Hans Nowak wrote:
> Hi,
>
> In Python (and Perl, etc) it's possible to name subpatterns (or "groups")
> in a regular expression. For example:
>
> In [1]: import re
>
> In [2]: s = "the quick brown fox"
>
> In [3]: rx = re.compile("(?P<foo>quick)")
I've just looked through "man perlre" fairly carefully and found
nothing like this at all. So I asked the Python regex
documentation:
Python adds an extension syntax to Perl's extension syntax. If
the first character after the question mark is a "P", you know
that it's an extension that's specific to Python. Currently
there are two such extensions: (?P<name>...) defines a named
group, and (?P=name) is a backreference to a named group. If
future versions of Perl 5 add similar features using a different
syntax, the re module will be changed to support the new syntax,
while preserving the Python-specific syntax for compatibility's
sake.
So, I'm afraid you're SOL.
-Robin
--
Lojban Reason #17: http://en.wikipedia.org/wiki/Buffalo_buffalo
Proud Supporter of the Singularity Institute - http://singinst.org/
http://www.digitalkingdom.org/~rlpowell/ *** http://www.lojban.org/