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  1. or download this
    $regex = ['foo','bar'];
$string = 'blah foo blah';
$string =~ s/$regex->[0]/$regex->[1]/;
  2. or download this
    $regex = ['(foo)','bar$1'];
$string = 'blah foo blah';
$string =~ s/$regex->[0]/$regex->[1]/;