string manipulation in python to convert the case of a word that comes next to "caps lock"

Question

I want to write a python code where given a string from user

s = "hello, caps lock people of caps lock stackoverflow !"

and should return "hello, PEOPLE of STACKOVERFLOW !"

Note: PEOPLE Aand STACKOVERFLOW are uppercase.

Cant figure how to do this. please help!

Answer 1

We can try using re.sub with a callback function:

def to_upper(match):
    return match.group(1).upper()

s = "hello, caps lock people of caps lock stackoverflow !"
out = re.sub(r'\bcaps lock (\S+)', to_upper, s)
print(out)

This prints:

hello, PEOPLE of STACKOVERFLOW !

The approach here is to use re.sub to find every occurrence of caps lock followed by some word. Then, this word match is passed to the callback function to_upper() which then returns the uppercase version as the replacement.