Regular Expression MySQL

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  4. SQL patterns do not match NULL values This is true both for LIKE and NOT LIKE
mysql>
mysql>
mysql> SELECT NULL LIKE '%', NULL NOT LIKE '%';
+---------------+-------------------+
| NULL LIKE '%' | NULL NOT LIKE '%' |
+---------------+-------------------+
|          NULL |              NULL |
+---------------+-------------------+
1 row in set (0.00 sec)
mysql>
mysql>