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@@###@@@ - this one doesn't exist @###@@@ & @##@@@ - the only plates which start with a single character followed by 2 or 3 digits are the one's starting with 'B'
Each line is a possible lp pattern organized by region/state and then likelihood. The parser goes through each line and tries to match @ = any letter # = any number ? = a skip position (can be anything, but remove it if encountered) [A-FGZ] is just a single char position with specific letter requirements. In this example, the regex defines characters ABCDEFGZ