Hi, folks. I just wanted to thank Martin Walsh and Kent Johnson, both of whom
furthered my education by replying (on-list) that the "P=" syntax is used to
refer to a named group in the same regular expression, i.e., the one in which
the "P<name>" construct was used in the first place. This is as opposed to the
thing I was trying to do, which was to use the "P=" syntax in a substitution.
-- Mike
----- Original Message ----
From: Michael Hannon <jm_han...@yahoo.com>
To: tutor@python.org
Sent: Sat, November 28, 2009 3:15:36 PM
Subject: [Tutor] Example of use of (?P<name>) and (?P=name) in Python regular
expressions?
Greetings. While looking into the use of regular expressions in Python, I saw
that it's possible to name match groups using:
(?P<name>...)
and then refer to them using:
(?P=name)
I was able to get this to work in the following, nonsensical, example:
>>> x = 'Free Fri Fro From'
>>> y = re.sub(r'(?P<test>\bFro\b)', r'Frodo (--matched from \g<test>)', x)
>>> y
'Free Fri Frodo (--matched from Fro) From'
>>>
But, as you can see, to refer to the match I used the "\g" notation (that I
found some place on the web).
I wasn't able to find a way to use the "P=" syntax, and I wasn't able to find
any working examples of this syntax on the web.
If you have a working example of the use of the "P=" syntax, will you please
send it to me?
Thanks.
-- Mike
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