regex - Python substitute a word for a word and the next concatenated -


i want able take in string , if r'\snot\s' located, concatenate 'not' , next word (replacing white space in between underscore).

so if string

string="not name brian , not happy nothing"

the result after regular expression be:

'not_that name brian , not_happy nothing'

(not in nothing not touched).

i need locate 'not' either seperated white space or @ start of sentence , join '_' , next word.

use re.sub() saving groups:

>>> re.sub(r"not\s\b(.*?)\b", r"not_\1", string) 'not_that name brian , not_happy nothing'

not\s\b(.*?)\b here match not followed space, followed word (\b word boundaries). (.*?) capturing group capture word after not can reference in substitution (\1).


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