Python regex syntax

Question

I am a beginner in python regex. so can someone help me understand following syntax?

r'^(?P<pk>\d+)/results/$'

I came across that statement while learning Django.

Martijn Pieters · Accepted Answer · 2013-04-12 09:38:18Z

4

The expression broken down:

^: match at the start of the string
(?P<pk>\d+): Match 1 or more digits (0-9) and capture that as the named group pk
/results/: Match the literal text /results/
$: Match at the end of the string.

So a URL path that starts with digits, followed by the text /results/ matches:

1234/results/
42/results/
3/results/

but anything else does not.

If used in a Django url configuration, the digits are captured and passed into the attached view as the pk keyword parameter.

answered Apr 12, 2013 at 9:38

Martijn Pieters

1.1m326 gold badges4.2k silver badges3.4k bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

+1 because, well, anyone who can make sense of any but the most trivial regex gets a +1 by default.

thanx dude . i really needed the help