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$str = "(<ref links=\" cit314-1 cit314-2 cit314-3 cit314-4 cit314-5\"/
+>)";

if( $str =~ s/<ref links="(.*?)"(.*?)\/>(?{ print $1, "\n" })/<ref lin
+ks="$1"$2><\/ref>/ ){
    print "Match was found." . "\n";
}
print $str . "\n";