Using a regular expression to remove a uppercase letter if it's previous and next letter is lowercase?

Question

I am new in regular expression. I want to remove a uppercase letter if it has lowercase before and after it. If the input is "I wilYl go theXre" then the output should be "I will go there". How can I get it?

Answer 1

You can use a lookaround:

import re 

s='I wilYl go theXre'

print(re.sub(r'(?<=[a-z])([A-Z])(?=[a-z])','',s))
#               ^ lookbehind     ^lookahead

Prints:

I will go there