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 name regexp "xiaohei"; +----+---------+-------+-----------+ | id | name | score | subject | +----+---------+-------+-----------+ | 13 | xiaohei | 80 | astronaut | | 14 | xiaohei | 80 | shuxue | | 15 | xiaohei | 80 | physics | | 16 | xiaohei | 80 | english | +----+---------+-------+-----------+ rows in set (0.00 sec) mysql> select * from test where name regexp "hei"; +----+---------+-------+-----------+ | id | name | score | subject | +----+---------+-------+-----------+ | 13 | xiaohei | 80 | astronaut | | 14 | xiaohei | 80 | shuxue | | 15 | xiaohei | 80 | physics | | 16 | xiaohei | 80 | english | +----+---------+-------+-----------+ rows in set (0.00 sec) mysql> select * from test where name regexp ".hei"; +----+---------+-------+-----------+ | id | name | score | subject | +----+---------+-------+-----------+ | 13 | xiaohei | 80 | astronaut | | 14 | xiaohei | 80 | shuxue | | 15 | xiaohei | 80 | physics | | 16 | xiaohei | 80 | english | +----+---------+-------+-----------+ rows in set (0.00 sec) mysql> select * from test where name regexp ".he"; +----+---------+-------+-----------+ | id | name | score | subject | +----+---------+-------+-----------+ | 13 | xiaohei | 80 | astronaut | | 14 | xiaohei | 80 | shuxue | | 15 | xiaohei | 80 | physics | | 16 | xiaohei | 80 | english | +----+---------+-------+-----------+ rows in set (0.00 sec) mysql> select * from test where name regexp "hei"; +----+---------+-------+-----------+ | id | name | score | subject | +----+---------+-------+-----------+ | 13 | xiaohei | 80 | astronaut | | 14 | xiaohei | 80 | shuxue | | 15 | xiaohei | 80 | physics | | 16 | xiaohei | 80 | english | +----+---------+-------+-----------+ rows in set (0.00 sec) mysql> select * from test where name regexp "hei|bai"; +----+---------+-------+-----------+ | id | name | score | subject | +----+---------+-------+-----------+ | 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 | +----+---------+-------+-----------+ 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 | 1.2xiaobai | 80 | english | | 11 | 2.2xiaobai | 80 | physics | | 12 | 3xiaobai | 80 | shuxue | | 13 | 123xiaohei | 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="123xiaohei" where id=13; Query OK, 1 row affected (0.01 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> select * from test where name regexp ‘[[:digit:]]{3}‘; +----+------------+-------+-----------+ | id | name | score | subject | +----+------------+-------+-----------+ | 13 | 123xiaohei | 80 | astronaut | +----+------------+-------+-----------+ 1 row in set (0.00 sec) mysql> select * from test where name regexp "^xiao"; +----+----------+-------+-----------+ | 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 | | 14 | xiaohei | 80 | shuxue | | 15 | xiaohei | 80 | physics | | 16 | xiaohei | 80 | english | +----+----------+-------+-----------+ 12 rows in set (0.00 sec) mysql> update test set name=".12xiaohei" where id=16; 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 | 2.2xiaobai | 80 | physics | | 12 | 3xiaobai | 80 | shuxue | | 13 | 123xiaohei | 80 | astronaut | | 14 | xiaohei | 80 | shuxue | | 15 | xiaohei | 80 | physics | | 16 | .12xiaohei | 80 | english | +----+------------+-------+-----------+ 16 rows in set (0.00 sec) mysql> select * from test where name regexp "[[:digit:]\\.]"; +----+------------+-------+-----------+ | id | name | score | subject | +----+------------+-------+-----------+ | 10 | 1.2xiaobai | 80 | english | | 11 | 2.2xiaobai | 80 | physics | | 12 | 3xiaobai | 80 | shuxue | | 13 | 123xiaohei | 80 | astronaut | | 16 | .12xiaohei | 80 | english | +----+------------+-------+-----------+ 5 rows in set (0.00 sec) mysql> select * from test where name regexp "^[[:digit:]\\.]"; +----+------------+-------+-----------+ | id | name | score | subject | +----+------------+-------+-----------+ | 10 | 1.2xiaobai | 80 | english | | 11 | 2.2xiaobai | 80 | physics | | 12 | 3xiaobai | 80 | shuxue | | 13 | 123xiaohei | 80 | astronaut | | 16 | .12xiaohei | 80 | english | +----+------------+-------+-----------+ 5 rows in set (0.00 sec)
原文：https://www.cnblogs.com/sea-stream/p/11306501.html