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  1. or download this
    use Regexp::Common qw(balanced);
if ($foo =~ / ( $RE{balanced} ) /x) { 
  print "grabbed $1";
}
  2. or download this
    $"=$,,$_=q>|\p4<6 8p<M/_|<('=>
.q>.<4-KI<l|2$<6%s!<qn#F<>;$,
.=pack'N*',"@{[unpack'C*',$_]
}"for split/</;$_=$,,y[A-Z a-z]
         {}cd;print lc