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)
