Python regex insert
python, regex
Solution
Capture the first three characters into a group and then the next three to another group. In the replacement part just add `-` after the first captured group followed by the second captured group.
>>> import re
>>> s = "x01777"
>>> m = re.sub(r'(\w\d\d)(\d\d\d)', r'\1-\2', s)
>>> m
'x01-777'
>>>
Problem
I have a String s ``` s = "x01777" ``` Now I want to insert a `-` into s at this position: ``` s = "x01-777" ``` I tried to do this with `re.sub()` but I can't figure out how to insert the `-` without deleting my regex (I need this complex structure of regex because the String I want to work with is much longer). Actually, it looks something like this: ``` re.sub('\w\d\d\d\d\d', 'here comes my replacement', s) ``` How do I have to set up my insertion?