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!
-- Regards, Edward WIJAYA Singapore
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