Regular Expressions MySQL Tutorial

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  3. Regular Expressions
  4. Match either zero or one a character
mysql>
mysql> SELECT 'ABC' REGEXP '^Aa?C';
+----------------------+
| 'ABC' REGEXP '^Aa?C' |
+----------------------+
|                    0 |
+----------------------+
1 row in set (0.00 sec)
mysql>
mysql> SELECT 'ABC' REGEXP '^ABa?C';
+-----------------------+
| 'ABC' REGEXP '^ABa?C' |
+-----------------------+
|                     1 |
+-----------------------+
1 row in set (0.00 sec)
mysql>
mysql> SELECT 'ABC' REGEXP '^Ba?C';
+----------------------+
| 'ABC' REGEXP '^Ba?C' |
+----------------------+
|                    0 |
+----------------------+
1 row in set (0.00 sec)
mysql>