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    ($var =~/(?<=use )neighbor[[:alpha:]-]* ([[:alnum:]\.-:]+)/) and do{
        print $1;
    };
    
  2. or download this
    Compiling REx `(?<!use )neighbor[[:alpha:]-]* ([[:alnum:]\.-:]+)'
    size 42 Got 340 bytes for offset annotations.
    ...
                                failed...
    Match failed
    Freeing REx: `"(?<!use )neighbor[[:alpha:]-]* ([[:alnum:]\\.-:]+)"'