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  1. or download this
    $haha = 'I have black tyres.';
$haha=`echo $haha | sed "s/tyre/tire/g"`;
print($haha, "\n");
# outputs: I have black tires.
  2. or download this
    $haha = 'I have black tyres.';
$haha =~ s/tyre/tire/g;
print($haha, "\n");
# outputs: I have black tires.