How do I write a regex to replace a word but keep its case in Python?

Question

Is this even possible?

Basically, I want to turn these two calls to sub into a single call:

re.sub(r\'\\bAword\\b\', \'Bword\', mystring)
re.sub(r\'\         


        

Answer 1

You can have functions to parse every match:

>>> def f(match):
        return chr(ord(match.group(0)[0]) + 1) + match.group(0)[1:]

>>> re.sub(r'\b[aA]word\b', f, 'aword Aword')
'bword Bword'