A tad simpler looping, and case-insensitive:
my $foo = 'Fsih my test variable is fsihd or is it gfsih or gfsihd f
my $from = 'fsih';
my $which = 3;
my $to = 'FISH'; # makes it easy to see
$foo =~ /\Q$from\E/ig for (1..$which);
substr($foo, pos($foo) - length($from), length($from), $to) if pos($fo
print "Foo = $foo\n";
Caution: Contents may have been coded under pressure.
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