mysql> select * from test; +----+----------+-------+-----------+ | id | name | score | subject | +----+----------+-------+-----------+ | 1 | xiaoming | 89 | shuxue | | 2 | xiaohong | 89 | shuxue | | 3 | xiaohong | 80 | english | | 4 | xiaohong | 80 | physics | | 5 | xiaohong | 80 | astronaut | | 6 | xiaoming | 80 | physics | | 7 | xiaoming | 80 | astronaut | | 8 | xiaoming | 80 | english | | 9 | xiaobai | 80 | astronaut | | 10 | xiaobai | 80 | english | | 11 | xiaobai | 80 | physics | | 12 | xiaobai | 80 | shuxue | | 13 | xiaohei | 80 | astronaut | | 14 | xiaohei | 80 | shuxue | | 15 | xiaohei | 80 | physics | | 16 | xiaohei | 80 | english | +----+----------+-------+-----------+ 16 rows in set (0.00 sec) mysql> select * from test where subject regexp "sh"; +----+----------+-------+---------+ | id | name | score | subject | +----+----------+-------+---------+ | 1 | xiaoming | 89 | shuxue | | 2 | xiaohong | 89 | shuxue | | 3 | xiaohong | 80 | english | | 8 | xiaoming | 80 | english | | 10 | xiaobai | 80 | english | | 12 | xiaobai | 80 | shuxue | | 14 | xiaohei | 80 | shuxue | | 16 | xiaohei | 80 | english | +----+----------+-------+---------+ 8 rows in set (0.00 sec) mysql> select * from test where subject regexp "^sh"; +----+----------+-------+---------+ | id | name | score | subject | +----+----------+-------+---------+ | 1 | xiaoming | 89 | shuxue | | 2 | xiaohong | 89 | shuxue | | 12 | xiaobai | 80 | shuxue | | 14 | xiaohei | 80 | shuxue | +----+----------+-------+---------+ 4 rows in set (0.00 sec) mysql> select * from test where subject regexp "^[sp]h"; +----+----------+-------+---------+ | id | name | score | subject | +----+----------+-------+---------+ | 1 | xiaoming | 89 | shuxue | | 2 | xiaohong | 89 | shuxue | | 4 | xiaohong | 80 | physics | | 6 | xiaoming | 80 | physics | | 11 | xiaobai | 80 | physics | | 12 | xiaobai | 80 | shuxue | | 14 | xiaohei | 80 | shuxue | | 15 | xiaohei | 80 | physics | +----+----------+-------+---------+ 8 rows in set (0.00 sec) mysql> select * from test where subject regexp "^s|ph"; +----+----------+-------+---------+ | id | name | score | subject | +----+----------+-------+---------+ | 1 | xiaoming | 89 | shuxue | | 2 | xiaohong | 89 | shuxue | | 4 | xiaohong | 80 | physics | | 6 | xiaoming | 80 | physics | | 11 | xiaobai | 80 | physics | | 12 | xiaobai | 80 | shuxue | | 14 | xiaohei | 80 | shuxue | | 15 | xiaohei | 80 | physics | +----+----------+-------+---------+ 8 rows in set (0.00 sec) mysql> select * from test where name regexp "xiaoming|xiaohei"; +----+----------+-------+-----------+ | id | name | score | subject | +----+----------+-------+-----------+ | 1 | xiaoming | 89 | shuxue | | 6 | xiaoming | 80 | physics | | 7 | xiaoming | 80 | astronaut | | 8 | xiaoming | 80 | english | | 13 | xiaohei | 80 | astronaut | | 14 | xiaohei | 80 | shuxue | | 15 | xiaohei | 80 | physics | | 16 | xiaohei | 80 | english | +----+----------+-------+-----------+ 8 rows in set (0.00 sec)
mysql> select * from test; +----+----------+-------+-----------+ | id | name | score | subject | +----+----------+-------+-----------+ | 1 | xiaoming | 89 | shuxue | | 2 | xiaohong | 89 | shuxue | | 3 | xiaohong | 80 | english | | 4 | xiaohong | 80 | physics | | 5 | xiaohong | 80 | astronaut | | 6 | xiaoming | 80 | physics | | 7 | xiaoming | 80 | astronaut | | 8 | xiaoming | 80 | english | | 9 | xiaobai | 80 | astronaut | | 10 | xiaobai | 80 | english | | 11 | xiaobai | 80 | physics | | 12 | xiaobai | 80 | shuxue | | 13 | xiaohei | 80 | astronaut | | 14 | xiaohei | 80 | shuxue | | 15 | xiaohei | 80 | physics | | 16 | xiaohei | 80 | english | +----+----------+-------+-----------+ 16 rows in set (0.00 sec) mysql> update test set name="1.2xiaobai" where id=10; Query OK, 1 row affected (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> select * from test; +----+------------+-------+-----------+ | id | name | score | subject | +----+------------+-------+-----------+ | 1 | xiaoming | 89 | shuxue | | 2 | xiaohong | 89 | shuxue | | 3 | xiaohong | 80 | english | | 4 | xiaohong | 80 | physics | | 5 | xiaohong | 80 | astronaut | | 6 | xiaoming | 80 | physics | | 7 | xiaoming | 80 | astronaut | | 8 | xiaoming | 80 | english | | 9 | xiaobai | 80 | astronaut | | 10 | 1.2xiaobai | 80 | english | | 11 | xiaobai | 80 | physics | | 12 | xiaobai | 80 | shuxue | | 13 | xiaohei | 80 | astronaut | | 14 | xiaohei | 80 | shuxue | | 15 | xiaohei | 80 | physics | | 16 | xiaohei | 80 | english | +----+------------+-------+-----------+ 16 rows in set (0.00 sec) mysql> select * from test where name regexp "\."; +----+------------+-------+---------+ | id | name | score | subject | +----+------------+-------+---------+ | 10 | 1.2xiaobai | 80 | english | +----+------------+-------+---------+ 1 row in set (0.00 sec) mysql> update test set name="2.2xiaobai" where id=11; Query OK, 1 row affected (0.01 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> select * from test where name regexp "[12]"; +----+------------+-------+---------+ | id | name | score | subject | +----+------------+-------+---------+ | 10 | 1.2xiaobai | 80 | english | | 11 | 2.2xiaobai | 80 | physics | +----+------------+-------+---------+ 2 rows in set (0.00 sec) mysql> update test set name="3xiaobai" where id=12; Query OK, 1 row affected (0.01 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> select * from test where name regexp "[12]"; +----+------------+-------+---------+ | id | name | score | subject | +----+------------+-------+---------+ | 10 | 1.2xiaobai | 80 | english | | 11 | 2.2xiaobai | 80 | physics | +----+------------+-------+---------+ 2 rows in set (0.00 sec) mysql> select * from test where name regexp "[12]\."; +----+------------+-------+---------+ | id | name | score | subject | +----+------------+-------+---------+ | 10 | 1.2xiaobai | 80 | english | | 11 | 2.2xiaobai | 80 | physics | +----+------------+-------+---------+ 2 rows in set (0.00 sec) mysql> select * from test where name regexp "[123]\."; +----+------------+-------+---------+ | id | name | score | subject | +----+------------+-------+---------+ | 10 | 1.2xiaobai | 80 | english | | 11 | 2.2xiaobai | 80 | physics | +----+------------+-------+---------+ 2 rows in set (0.00 sec) mysql> select * from test where name regexp "[123]"; +----+------------+-------+---------+ | id | name | score | subject | +----+------------+-------+---------+ | 10 | 1.2xiaobai | 80 | english | | 11 | 2.2xiaobai | 80 | physics | | 12 | 3xiaobai | 80 | shuxue | +----+------------+-------+---------+ 3 rows in set (0.00 sec)