# SPLIT THE IP-ADDRESSES INTO FOUR =STRINGS= BY
# THE PERIOD CHARACTER.
my ($a1, $a2, $a3, $a4) = split('.', @$a);

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The split built-in function does not use single-quotes around a  /PATTERN/ argument to 'meta-quote' the argument: the  '.' in the above really is trying to split on "any character except newline". Use  '\.' to split on a literal period. 

>perl -wMstrict -le
"my $s = 'a.bb.ccc.d';
 ;;
 my @ra = split '.', $s;
 print 'naked dot';
 printf qq{  '$_'} for @ra;
 print '@ra elements: ', scalar @ra;
 ;;
 @ra = split '\.', $s;
 print 'escaped dot';
 printf qq{  '$_'} for @ra;
"
naked dot
@ra elements: 0
escaped dot
  'a'  'bb'  'ccc'  'd'

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In reply to Re^2: Sort hash with values by AnomalousMonk
in thread Sort hash with values by Rahul Gupta

Title:
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