例如以下为mysql必知必会第九章開始：

正則表達式用于匹配特殊的字符集合。mysql通过where子句对正則表達式提供初步的支持。

keywordregexp用来表示后面跟的东西作为正則表達式处理。

（.）是正則表達式的一个符号，表示匹配随意一个字符：

mysql> select prod_name

    -> from products

    -> where prod_name regexp '.000'

    -> order by prod_name;

+--------------+

| prod_name    |

+--------------+

| JetPack 1000 |

| JetPack 2000 |

+--------------+

2 rows in set (0.14 sec)

|匹配符：

表示匹配当中之中的一个

mysql> select prod_name

    -> from products

    -> where prod_name REGEXP '1000|2000'

    -> ORDER BY prod_name;

+--------------+

| prod_name    |

+--------------+

| JetPack 1000 |

| JetPack 2000 |

+--------------+

2 rows in set (0.00 sec)

[]匹配符： 匹配几个字符之中的一个

2 rows in set (0.00 sec)

mysql> select prod_name

    -> from products

    -> where prod_name regexp '[123] Ton'

    -> ;

+-------------+

| prod_name   |

+-------------+

| 1 ton anvil |

| 2 ton anvil |

+-------------+

2 rows in set (0.00 sec)

mysql> select prod_name from products where prod_name regexp '[1-5] Ton';

+--------------+

| prod_name    |

+--------------+

| .5 ton anvil |

| 1 ton anvil  |

| 2 ton anvil  |

+--------------+

3 rows in set (0.02 sec)

(^)否定匹配符：

mysql> select prod_name from products where prod_name regexp '[^1-3] Ton';

+--------------+

| prod_name    |

+--------------+

| .5 ton anvil |

+--------------+

1 row in set (0.00 sec)

匹配特殊字符，必须用\\为前导。

mysql> select prod_name from products where prod_name regexp '\\.' ;

+--------------+

| prod_name    |

+--------------+

| .5 ton anvil |

+--------------+

1 row in set (0.00 sec)

匹配字符类：

mysql> select prod_name from products where prod_name REGEXP '\\([0-9] sticks?\\)' order by prod_name;

+----------------+

| prod_name      |

+----------------+

| TNT (1 stick)  |

| TNT (5 sticks) |

+----------------+

2 rows in set (0.05 sec)

mysql> select prod_name from products where prod_name REGEXP '[[:digit:]]{4}' order by prod_name;

+--------------+

| prod_name    |

+--------------+

| JetPack 1000 |

| JetPack 2000 |

+--------------+

2 rows in set (0.00 sec)

定位符使用方法：

mysql> select prod_name

    -> from products

    -> where prod_name REGEXP '^[0-9\\.]'

    -> order by prod_name;

+--------------+

| prod_name    |

+--------------+

| .5 ton anvil |

| 1 ton anvil  |

| 2 ton anvil  |

+--------------+

3 rows in set (0.00 sec)

以上都是mysql正則表達式的使用方法。