How to make a regex for files ending in .php?

Question

I\'m trying to write a very simple regular expression that matches any file name that doesn\'t end in .php. I came up with the following...

(.*?)(?!\\.php)$         


        

Answer 1

Almost:

.*(?!\.php)....$

The last four dots make sure that there is something to look ahead at, when the look-ahead is checked.

The outer parentheses are unnecessary since you are interested in the entire match.

The reluctant .*? is unnecessary, since backtracking four steps is more efficient than checking the following condition with every step.