RE fun

I wanted to match filenames that don't end with .doc and I came up with [^.]*|.*\.(?!doc)[^.]*. Hmm, regexes are hard to read. Let's reformat...

(?x)    # comments and whitespace
[^.]*   # something with no dots
|       # ...or...
.*      # something...
\.      # ...with a dot...
(?!doc) # ...not followed by "doc"...
[^.]*   # ...but followed by soemthing with no dots