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  1. or download this
    #!/usr/bin/perl --
    print $_="barfoo bazfoo foofoo barfoo\n";
    ...
    print "$snum $_";
    print '#' x 5, "\n";
    __END__
    
  2. or download this
    use YAPE::Regex::Explain;
    print YAPE::Regex::Explain ->new(
        qr/\b((?<!bar)(?!bar)\S{3,})/
    ...
    ----------------------------------------------------------------------
    )                        end of grouping
    ----------------------------------------------------------------------