<?php
$subject = 'customers.id NOT IN (SELECT MAX(customers_service.customer_id))
customers.id NOT LIKE (SELECT MAX(customers_service.customer_id))
id NOT IN (SELECT MAX(customers_service.customer_id))
id IN (SELECT MAX(customers_service.customer_id))' ;
$pattern = '~
(?(DEFINE)(?<KEYWORD>
(?:NOT(?:\s+(?:IN|LIKE))?|IN|LIKE|BETWEEN|REGEXP|IS(?:\s+NOT)?|XOR)\b
))
(?<![.\w@-])(?!(?&KEYWORD))[\w@-]+\s+(?&KEYWORD)\s*
~ix' ;
?>
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