Part 5: Regex Golf

Regex Golf is a game wherein you try to construct a regular expression that matches one set of words while not matching a second set (i.e., by minimizing false positives). There are many levels, and they get difficult quickly. For this part of the assignment, please attempt the first five levels (up through Abba)

this is the below link given in the question:

https://alf.nu/RegexGolf