Are you sure that this ran on your system and that you copied it correctly? I tried running your code, but the if statement is evaluating to be false, which means nothing is printed.

Here's a few observations.

• In your regex, you have ("|'). However, there is no closing single or double quotes. Also, if you don't have a | in $line (as you currently don't), this part of the regex will cause it to evaluate to false.
• In your regex, you have \3 twice. If you want to match the number 3, there is no need to escape it. If you want to match on a backslash, you'll to have it escaped (\\).

At the moment, I think you have some stuff in your regex that is doing something other than what you're wanting to do. Of course, being no regex expert myself, I could be very wrong about that. Perhaps someone else with more knowledge and/or experience can shed more light on the situation.