If you can use substr(), use it, because it works much faster than regexp.
Teddy
----- Original Message -----
From: "Edward WIJAYA" <[EMAIL PROTECTED]>
To: <beginners@perl.org>
Sent: Sunday, January 02, 2005 5:08 PM
Subject: Choosing between Regexp and Substr
> Dear friends,
>
> After a couple of months dwelling into Perl scripting especially in
> manipulating strings, I found myself resorting to use "substr" function a
> lot.
>
> I had a feeling that the most of the "substr" function can be replaced
> with regexp in any cases. For example the simple code below. I wonder how
> would masters redo this function with pure reqexp approach.
>
> __BEGIN__
> sub hamming_distance_string{
> #String length is assumed to be equal
> my ($a,$b) = @_;
> my $len = length ($a);
> my $num_match=0;
>
> for (my $i=0; $i<$len; $i++) {
> ++$num_match if substr($a, $i, 1) eq substr($b, $i,1);
> }
>
> return $num_match;
> }
>
> __END__
>
> Is it true that 'substr' function can be rewritten with regexp all the
> time? If so when is it better to use which? Any rule of thumb?
>
> Hope to hear from you again. Thanks so much for your time.
> And wishing you all a very Happy and Prosperous New Year 2005!
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