python how to replace string by regex group?

Question

Give an string like '/apps/platform/app/app_name/etc', I can use

p = re.compile('/apps/(?P<p1>.*)/app/(?P<p2>.*)/')

to get two matched groups of platform and app_name, but how can I use re.sub function (or maybe better way) to replace those two groups with other string like windows and facebook? So the final string would like /apps/windows/app/facebook/etc.

Are you sure you want to be using a regex and not os.path for this? — NPE
– NPE, Commented Dec 25, 2014 at 9:29
@NPE I have no idea about the relationship between string replace and os.path. but maybe you can show me some code:) — LeoShi
– LeoShi, Commented Dec 25, 2014 at 9:34

Avinash Raj · Accepted Answer · 2014-12-25 09:38:21Z

3

Separate group replacement wouldn't be possible through regex. So i suggest you to do like this.

(?<=/apps/)(?P<p1>.*)(/app/)(?P<p2>.*)/

DEMO

Then replace the matched characters with windows\2facebook/ . And also i suggest you to define your regex as raw string. Lookbehind is used inorder to avoid extra capturing group.

>>> s = '/apps/platform/app/app_name/etc'
>>> re.sub(r'(?<=/apps/)(?P<p1>.*)(/app/)(?P<p2>.*)/', r'windows\2facebook/', s)
'/apps/windows/app/facebook/etc'

edited Dec 25, 2014 at 9:38

answered Dec 25, 2014 at 9:32

Avinash Raj

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