Surely such a format has a parser already , but anyway, I'm sure this will work, untested 

my $pat = qr~
  \@include
  \s+
  ( 
    (?: '[^']*' )
    |
    (?: "[^"]*" )
    |
    (?:
       (?:\\.)
       |
       [^\\s]
    )+
  )
~x;

[download]

[^" makes a good search term to find regex for similar formats, like ?node_id=3989;BIT=%5B%5E%22 -> Re^3: More robust link finding than HTML::LinkExtor/HTML::Parser?, Re: skip over an escaped single quote

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

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