Negative lookahead not working, help please

[Ofnuts]

But if nobody else will ever see your code, feel free to do whatever you want :P

Somebody else will see your code: yourself, six months later, with a hangover/flu/bad night. Don't code too cleverly.

Also, ponder this Brian Kernighan thought: "Everyone knows that debugging is twice as hard as writing a program in the first place. So if you're as clever as you can be when you write it, how will you ever debug it?".

("The Elements of Programming Style").