If $str contains "Rabbit" or "rabbit" i want it to be replaced with "pap".
Hashes, by default, are case sensitive. However, if you take care to create the hash with all lower case keys, you could then simply lower case each input string, for example:
use strict;
use warnings;
my %hash = ( "rabbit" => "pap", "triangle" => "tri" );
my $key = "rabbit";
print $hash{ lc($key) }, "\n"; # prints "pap"
$key = "Rabbit";
print $hash{ lc($key) }, "\n"; # also prints "pap"
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You can do that with regex with 'i' option modifier which stands for ignore case. Refer perlre. For example,
$str =~ /rabbit/i
But TIMTOWTDI, you can do that with functions also.
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