case folding problem on z/OS

Hi,
Here's a case folding test :

$a = '0178';
$b = '00FF';

$a1 = pack("U0U*", hex $a);
$b1 = pack("U0U*", map { hex } split " ", $b);

if (":$b1:" =~ /:[$a1]:/i) {
print "ok\n";
}

The above fails on z/OS (on perl-5.8.6).
However, if I remove the colon characters from the
test, i.e. 
if ("$b1" =~ /[$a1]/i) {
print "ok\n";
}
then it works fine. 

Any thoughts on why the colon characters cause the
regexp to fail ? also, any pointers to locate the
problem area in the code would be helpful.

Thanks in advance,
Rajarshi.




		
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