%cat = (
    'C[AEIOU]NWAY' => 'AAA',
    '(BOSTON|CHICAGO)' => 'BBB',
    '(LAS VEGAS|NEVADA)' => 'CCC'
    '(DALLAS|AUSTIN)' => 'DDD'  
    '(NASHVILLE|M[AEIOU]MPHIS)' => 'EEE'    
);