This works with the samples supplied:

print $data;;

#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?

print for $data =~ m[\@include\s('[^']+'|"[^"]+"|.+?(?<!\\))\s]g;;
"some file"
'another file'
yet\ another\ file

[download]

Spreading that out a bit:

m[
  \@include \s       ## the introducer followed by a space
  (                  ## capture
      '[^']+'        ## A single quoted string with no embedded single
+ quotes
  |                  ## or
      "[^"]+"        ## a double quoted string with no embedded double
+ quotes
  |                  ## or
      .+? (?<!\\)    ## a min length string that ends in a space that 
+isn't escaped
  )
  \s
]gx;;

[download]
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

The start of some sanity?

In reply to Re: Help with a regular expression for file name parsing by BrowserUk
in thread Help with a regular expression for file name parsing by bontchev

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