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if ( /^[brc]at$/ ) {  # match "bat", "rat", or "cat"
    print "It's an animal\n";
...
        print "... and it flies!\n";
    }
}

if ( /^[brc]at$/ ) {
    print "It's an animal\n";
...
if ( /^b/ ) {
    print "... and it flies!\n";
}