There's a very cute module called
Quantum::Superpositions that will let you do this:
if ($b == any(1, 2, 3, 4, 5)) {
print "\$b has to be a number and is either 1, 2, 3, 4, or 5.";
}
TMTOWTDI... especially when CPAN gets into the picture!
Update: After rereading the thread and the rest of the replies... maybe the method I gave here is best considered as a curiosity or demonstration of this module's abilities, rather than as a practical solution. Just don't forget about it when you need to solve a more general version of the problem.
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