An example of davido's in-place string modification combined with boftx's dispatch table handler:
>perl -wMstrict -le
"use constant LEN => 5;
;;
my $s = '1234598765555553456733333';
print qq{'$s'};
;;
my %dispatch = (
'55555' => sub { return 'x' x length $_[0]; },
);
;;
for (my $offset = 0; $offset < length $s; $offset += LEN) {
for (substr $s, $offset, LEN) {
$_ = exists $dispatch{$_} ? $dispatch{$_}->($_) : $_ + 2;
}
}
print qq{'$s'};
"
'1234598765555553456733333'
'1234798767xxxxx3456933335'
Update: Changed example code to also exemplify topicalization of sub-string segment via for-structure (given no longer being quite kosher).
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