Really not sure whether this is any better, but you could use (string) eval, as shown here under the debugger:
DB<1> $number1 = 2011;
DB<2> $number2 = 2011;
DB<3> $selectioncriterium = '=='
DB<4> print "number1 is ", eval "$number1 $selectioncriterium $num
+ber2" ? "" : "not ", "equal to $number2\n";
number1 is equal to 2011
DB<5> print "number1 is ", eval "$number1 $selectioncriterium 7842
+"? "" : "not ", "equal to 7842\n";
number1 is not equal to 7842
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