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  1. or download this
    $gw="abcdefgh";
if ($gw =~ m/abc/ig){
...
if ($gw =~ m/fg/ig){
    print "fg\n";
}
  2. or download this
    abc
defgh
fg
  3. or download this
    abc
cde
defgh
gh
fg
  4. or download this
    $gw1, $gw2, $gw3, $gw4, $gw5 = $gw;
if ($gw =~....
if ($gw1 =~....
if ($gw2 =~....
etc...