mysql> select * from test;

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

| id | name     | score | subject   |

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

|   | xiaoming |     | shuxue    |

|   | xiaohong |     | shuxue    |

|   | xiaohong |     | english   |

|   | xiaohong |     | physics   |

|   | xiaohong |     | astronaut |

|   | xiaoming |     | physics   |

|   | xiaoming |     | astronaut |

|   | xiaoming |     | english   |

|   | xiaobai  |     | astronaut |

|  | xiaobai  |     | english   |

|  | xiaobai  |     | physics   |

|  | xiaobai  |     | shuxue    |

|  | xiaohei  |     | astronaut |

|  | xiaohei  |     | shuxue    |

|  | xiaohei  |     | physics   |

|  | xiaohei  |     | english   |

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

 rows in set (0.00 sec)

mysql> select * from test where name regexp "xiaohei";

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

| id | name    | score | subject   |

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

|  | xiaohei |     | astronaut |

|  | xiaohei |     | shuxue    |

|  | xiaohei |     | physics   |

|  | xiaohei |     | english   |

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

rows in set (0.00 sec)

mysql> select * from test where name regexp "hei";

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

| id | name    | score | subject   |

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

|  | xiaohei |     | astronaut |

|  | xiaohei |     | shuxue    |

|  | xiaohei |     | physics   |

|  | xiaohei |     | english   |

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

rows in set (0.00 sec)

mysql> select * from test where name regexp ".hei";

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

| id | name    | score | subject   |

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

|  | xiaohei |     | astronaut |

|  | xiaohei |     | shuxue    |

|  | xiaohei |     | physics   |

|  | xiaohei |     | english   |

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

rows in set (0.00 sec)

mysql> select * from test where name regexp ".he";

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

| id | name    | score | subject   |

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

|  | xiaohei |     | astronaut |

|  | xiaohei |     | shuxue    |

|  | xiaohei |     | physics   |

|  | xiaohei |     | english   |

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

rows in set (0.00 sec)

mysql> select * from test where name regexp "hei";

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

| id | name    | score | subject   |

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

|  | xiaohei |     | astronaut |

|  | xiaohei |     | shuxue    |

|  | xiaohei |     | physics   |

|  | xiaohei |     | english   |

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

rows in set (0.00 sec)

mysql> select * from test where name regexp "hei|bai";

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

| id | name    | score | subject   |

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

|   | xiaobai |     | astronaut |

|  | xiaobai |     | english   |

|  | xiaobai |     | physics   |

|  | xiaobai |     | shuxue    |

|  | xiaohei |     | astronaut |

|  | xiaohei |     | shuxue    |

|  | xiaohei |     | physics   |

|  | xiaohei |     | english   |

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

rows in set (0.00 sec)
mysql> select * from test;

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

| id | name       | score | subject   |

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

|   | xiaoming   |     | shuxue    |

|   | xiaohong   |     | shuxue    |

|   | xiaohong   |     | english   |

|   | xiaohong   |     | physics   |

|   | xiaohong   |     | astronaut |

|   | xiaoming   |     | physics   |

|   | xiaoming   |     | astronaut |

|   | xiaoming   |     | english   |

|   | xiaobai    |     | astronaut |

|  | .2xiaobai |     | english   |

|  | .2xiaobai |     | physics   |

|  | 3xiaobai   |     | shuxue    |

|  | 123xiaohei |     | astronaut |

|  | xiaohei    |     | shuxue    |

|  | xiaohei    |     | physics   |

|  | xiaohei    |     | english   |

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

 rows in set (0.00 sec)

mysql> update test set name="123xiaohei" where id=;

Query OK,  row affected (0.01 sec)

Rows matched:   Changed:   Warnings: 

mysql> select * from test where name regexp '[[:digit:]]{3}';

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

| id | name       | score | subject   |

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

|  | 123xiaohei |     | astronaut |

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

 row in set (0.00 sec)

mysql> select * from test where name regexp "^xiao";

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

| id | name     | score | subject   |

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

|   | xiaoming |     | shuxue    |

|   | xiaohong |     | shuxue    |

|   | xiaohong |     | english   |

|   | xiaohong |     | physics   |

|   | xiaohong |     | astronaut |

|   | xiaoming |     | physics   |

|   | xiaoming |     | astronaut |

|   | xiaoming |     | english   |

|   | xiaobai  |     | astronaut |

|  | xiaohei  |     | shuxue    |

|  | xiaohei  |     | physics   |

|  | xiaohei  |     | english   |

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

 rows in set (0.00 sec)

mysql> update test set name=".12xiaohei" where id=;

Query OK,  row affected (0.00 sec)

Rows matched:   Changed:   Warnings: 

mysql> select * from test;

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

| id | name       | score | subject   |

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

|   | xiaoming   |     | shuxue    |

|   | xiaohong   |     | shuxue    |

|   | xiaohong   |     | english   |

|   | xiaohong   |     | physics   |

|   | xiaohong   |     | astronaut |

|   | xiaoming   |     | physics   |

|   | xiaoming   |     | astronaut |

|   | xiaoming   |     | english   |

|   | xiaobai    |     | astronaut |

|  | .2xiaobai |     | english   |

|  | .2xiaobai |     | physics   |

|  | 3xiaobai   |     | shuxue    |

|  | 123xiaohei |     | astronaut |

|  | xiaohei    |     | shuxue    |

|  | xiaohei    |     | physics   |

|  | .12xiaohei |     | english   |

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

 rows in set (0.00 sec)

mysql> select * from test where name regexp "[[:digit:]\\.]";

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

| id | name       | score | subject   |

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

|  | .2xiaobai |     | english   |

|  | .2xiaobai |     | physics   |

|  | 3xiaobai   |     | shuxue    |

|  | 123xiaohei |     | astronaut |

|  | .12xiaohei |     | english   |

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

 rows in set (0.00 sec)

mysql> select * from test where name regexp "^[[:digit:]\\.]";

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

| id | name       | score | subject   |

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

|  | .2xiaobai |     | english   |

|  | .2xiaobai |     | physics   |

|  | 3xiaobai   |     | shuxue    |

|  | 123xiaohei |     | astronaut |

|  | .12xiaohei |     | english   |

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

 rows in set (0.00 sec)

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