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Does it have to be a regex? tr/// provides a simpler solution.

#!/usr/bin/perl -w use strict; while (my $str = <DATA>) { my $odd = $str =~ tr/1// & 1; print $str,"has an ",$odd?"odd":"even"," number of 1's",$/; } __DATA__ 110101010110111010101 100000000000000000001 101010101010101010101 110000000000000000011 110100000000000000000 11

Output:

110101010110111010101 has an odd number of 1's 100000000000000000001 has an even number of 1's 101010101010101010101 has an odd number of 1's 110000000000000000011 has an even number of 1's 110100000000000000000 has an odd number of 1's 11 has an even number of 1's
90% of every Perl application is already written.
dragonchild

In reply to Re: Number of bits, length of RegExp by pfaut
in thread Number of bits, length of RegExp by YAFZ

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