I was able to run this code with my long word list. It appears to not be grabbing some matches that I need, but I do not know enough about regular expressions to be able to fix it. For example, when I run the code looking for a/b swap matches, 'lama' and 'lamb' should be a match but it is not showing up as such. I'm guessing it's to do with the fact that 'lama' has two a's? Is it possible to easily amend this code to handle this case?