## http://cpansearch.perl.org/src/NEVESENIN/CSS-Packer-1.000001/lib/CSS/Packer.pm
our $DICTIONARY     = {
    'STRING1'   => qr~"(?>(?:(?>[^"\\]+)|\\.|\\"|\\\s)*)"~,
    'STRING2'   => qr~'(?>(?:(?>[^'\\]+)|\\.|\\'|\\\s)*)'~
};
our $URL            = 'url\(\s*(' . $DICTIONARY->{STRING1} . '|' . $DICTIONARY->{STRING2} . '|[^\'"\s]+?)\s*\)';
our $IMPORT         = '\@import\s+(' . $DICTIONARY->{STRING1} . '|' . $DICTIONARY->{STRING2} . '|' . $URL . ')([^;]*);';