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  1. or download this
    $ perl -le " $_ = q{abcdef}; print for m{(.)(.)}g;
a
...
$ perl -le " $_ = q{abcdef}; print for m{(.)(.)*}g;
a
f
  2. or download this
    $cmd=q|&COMPAREEQUAL(First-param.one, Second.param,Third-param)|;

...
[undef, undef]
[undef, "Third-param"]
[undef, undef]