Your regular expression works, but the code is rather a muddle. Here's a version that he can use to test with:
in reply to Re: Help with a regular expression for file name parsing
in thread Help with a regular expression for file name parsing
$data = join '', <DATA>;
print "$_\n" for $data =~ m[\@include\s('[^']+'|"[^"]+"|.+?(?<!\\))\s]
#some "random stuff" @include "some file" did you parse that?
#more 'random' stuff @include 'another file' you sure?
#and more random stuff @include yet\ another\ file positive?