opcode sequence.

Hi,
Here's a test on perl-5.8.6 run on z/OS :
 
$a = '0178';
$b = '00FF';
 
$a1 = pack("U0U*", hex $a);
$b1 = pack("U0U*", map { hex } split " ", $b);
 
if (":$b1:" =~ /:[$a1]:/i)
print "ok";
 
The test runs through the opcodes OP_REGCOMP, OP_MATCH and then gets into the opcode OP_COND_EXPR. 
 
Now, if I change $a = '212B' and $b = '00E5'
the test runs through the opcodes OP_REGCOMP, OP_MATCH and then gets into OP_AND (and not OP_COND_EXPR). 
why is this so ? 
 
Thanks,
Rajarshi.

		
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