in reply to split a string at a defined index

And one more solution: 
use strict;
use warnings;

while (my $row = <DATA>) {
    chomp $row;
    my @elements = split ',', $row;
    my $tail = pop @elements;
    my $body = join ',', @elements;
    print "$body -- $tail\n";
}

__DATA__
www,google,yahoo,345
www,google,yahoo,75323

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CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

In Section Seekers of Perl Wisdom