How to use python regex to replace using captured group? [duplicate] How to use python regex to replace using captured group? [duplicate] python python

How to use python regex to replace using captured group? [duplicate]


python regex sed replace

You need to escape your backslash:

p.sub('gray \\1', s)

alternatively you can use a raw string as you already did for the regex:

p.sub(r'gray \1', s)

python regex sed replace

As I was looking for a similar answer; but wanting using named groups within the replace, I thought I'd add the code for others:

p = re.compile(r'blue (?P<animal>dog|cat)')p.sub(r'gray \g<animal>',s)

python regex sed replace

Off topic,For numbered capture groups:

#/usr/bin/env pythonimport rere.sub(    pattern=r'(\d)(\w+)',     repl='word: \\2, digit: \\1',     string='1asdf')

word: asdf, digit: 1

Python uses literal backslash, plus one-based-index to do numbered capture group replacements, as shown in this example. So \1, entered as '\\1', references the first capture group (\d), and \2 the second captured group.

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