python - How to escape number in regex -

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so replacing characters re module.
have string 'abc_def' , need add 1 after _.
doing this. 

st = 'abc_def' re.sub(r'^(\w+_)('')(\w+)$',r'\11\3',st)

but takes \11 11th captured group, not \1 , 1 separately.

btw r\1,1\3 works should, returns abc_,1def.

need !

you can use \g<number> instead of \number:

re.sub(r'^(\w+_)('')(\w+)$',r'\g<1>1\3',st)

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