Regex match even number of letters

Question

I need to match an expression in Python with regular expressions that only matches even number of letter occurrences. For example:

AAA        # no match
AA                


        

Answer 1

This searches for a block with an odd number of A's. If you found one, the string is bad for you:

(?

If I understand correctly, the Python code should look like:

if re.search("(?