dont know if this helps, but the following code 

$one = "ExamPle";
$two = "example";

if ($one=~/$two/i)
{
print "true ";
}
print "false";

outputs:
 true false 
(ie evaluates the expression in the curly braces)
and if you change the top word to ExanPle (change the m to n)
then it only outputs:
 false

Hope that is of some help :)

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