my $str = 'Fsih my test variable is fsihd or is it gfsih or gfsih
+d fsih';
# 1111 2222 3333
+ 4444
my $substr = 'fsih';
my $replace = 'fish';
my $instance = 3; # 3rd
print("$str\n");
my $pos = -length($substr);
for (;;) {
last if !$instance--;
$pos = index($str, $substr, $pos + length($substr));
last if $pos < 0;
}
substr($str, $pos, length($substr), $replace)
if $pos >= 0;
print("$str\n");
Update: Fixed off-by-one error.
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