mysql> create table test(a varchar(30));
Query OK, 0 rows affected (0.34 sec)

mysql> insert into test values('TTai'), ('t_t'), ('0T_T0'), ('san~qiang'), ('sanqiang'), ('gerenyouxi'), ('gren\\youxi');
Query OK, 7 rows affected (0.08 sec)
Records: 7  Duplicates: 0  Warnings: 0

mysql> select * from test;
+------------+
| a          |
+------------+
| TTai       |
| t_t        |
| 0T_T0      |
| san~qiang  |
| sanqiang   |
| gerenyouxi |
| gren\youxi |
+------------+
7 rows in set (0.02 sec)

mysql> select * from test where a like '%T_T%';
+-------+
| a     |
+-------+
| t_t   |
| 0T_T0 |
+-------+
2 rows in set (0.00 sec)

mysql> select * from test where a  like '%san~%';
+-----------+
| a         |
+-----------+
| san~qiang |
+-----------+
1 row in set (0.00 sec)