mysql>mysql> SELECT 'ABC' REGEXP '^(ABC)*$';+-------------------------+| 'ABC' REGEXP '^(ABC)*$' |+-------------------------+| 1 |+-------------------------+1 row in set (0.00 sec)mysql>mysql> SELECT 'ABC' REGEXP '^(AB)*$';+------------------------+| 'ABC' REGEXP '^(AB)*$' |+------------------------+| 0 |+------------------------+1 row in set (0.00 sec)mysql>mysql> SELECT 'ABCABC' REGEXP '^(AB)*$';+---------------------------+| 'ABCABC' REGEXP '^(AB)*$' |+---------------------------+| 0 |+---------------------------+1 row in set (0.00 sec)mysql>
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