How to replace string using RE group in python?

Question

I have a problem when using RE module in python:

import re
url='http://list.xxx.com/0-20356-1-0-0-0-0-0-0-0-269036.html'
re_rule=re.compile('.+20356\-(\d{1,3})-0-0-0.+')
new_url=re_rule.sub('2 \1')

As I wish, the new_url would be 'http://list.xxx.com/0-20356-2-0-0-0-0-0-0-0-269036.html', but python returns new_url=2.
I know I had make mistakes when using re module. Which mistakes had I make and how to correct them?

Eric Dill · Accepted Answer · 2016-07-09 12:51:59Z

1

Given your example, why even bother using re?

url = 'http://list.xxx.com/0-20356-1-0-0-0-0-0-0-0-269036.html'
new_url = url.replace('-1-', '-2-')
print(new_url)

produces what you're looking for:

http://list.xxx.com/0-20356-2-0-0-0-0-0-0-0-269036.html

answered Jul 9, 2016 at 12:51

Eric Dill

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2 Comments

nick Over a year ago

Because my given code is only an example,actually I'm writing a function ,there are lots of urls to reset,so I tried re . Your answer has solved my problems,and then ,can you tell me how to achieve using re?

Eric Dill Over a year ago

You could essentially do the same thing with re.sub. re.sub('-1-', '-2-', url) will produce the same thing as the url.replace code above. There are some extra flags on re.sub that make it more versatile. Have a look at the docs here: docs.python.org/2/library/re.html#re.sub

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