understanding the regular expression in python

Question

I am learning re in python.
I understand all other things in the following example.
but, i really dont understand what special (in tags) means in the following example.

re.compile('((?P<special>[0:-])\s)')

kindly help if know it.

jfs · Accepted Answer · 2012-03-17 06:28:28Z

5

They're called named capturing groups.

A quick explanation here:

Python's regex module was the first to offer a solution: named capture. By assigning a name to a capturing group, you can easily reference it by name. (?P<name>group) captures the match of group into the backreference "name". You can reference the contents of the group with the numbered backreference \1 or the named backreference (?P=name).

edited Mar 17, 2012 at 6:28

jfs

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answered Mar 17, 2012 at 6:22

r_31415

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Ceramic Pot · Accepted Answer · 2012-03-17 06:22:05Z

2

This is called Named Capture Group.

answered Mar 17, 2012 at 6:22

Ceramic Pot

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