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)
