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  1. or download this
    my $var = "foobarfoobaz";
$var =~ s/foo//;
say $var;   # says "barfoobaz"
  2. or download this
    my $var = "foobarfoobaz";
$var =~ s/foo//g;
say $var;   # says "barbaz"
  3. or download this
    my $var = "foobarfoobaz";
$var =~ s@foo@@g;
say $var;   # says "barbaz"
  4. or download this
    my $var = "foobarfoobaz";
$var =~ s{foo}{}g;
say $var;   # says "barbaz"