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($var =~/(?<=use )neighbor[[:alpha:]-]* ([[:alnum:]\.-:]+)/) and do{
    print $1;
};

Compiling REx `(?<!use )neighbor[[:alpha:]-]* ([[:alnum:]\.-:]+)'
size 42 Got 340 bytes for offset annotations.
...
                            failed...
Match failed
Freeing REx: `"(?<!use )neighbor[[:alpha:]-]* ([[:alnum:]\\.-:]+)"'