Note: I found a bug in my earlier answer, since I
can't edit it, I am posting this follow up. If
the string to replace has the substring you are trying to
find, it can get into an endless loop. Here is an updated
ansewer:
my $string = '01234567890';
my $find = '0';
my $replace = 'a';
my $pos = index($string, $find);
while($pos > -1) {
substr($string, $pos, length($find), $replace);
$pos = index($string, $find, $pos + length($replace));
}
In this case, an s/// regex is actually 5%
faster.
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