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  1. or download this
    while($string=~ m/reg(ex)/)
{
    $string=~ s/$1/ister/;
}
  2. or download this
    my $string = "Sometimes there are extra effects you didn't foresee whe
+n using a regex.";

...

print $string;
  3. or download this
    Sometimes there are istertra effects you didn't foresee when using a r
+egister.