Is it possible to enforce data checking in MySQL using Regular Expression?

Yes, it is possible to enforce data checking in MySQL using regular expression. First, you need to create a table. After that you need to create a trigger before insert in table. Here, we will be checking the Phone Number format.

The query to create a table is as follows

mysql> create table enforceDataUsingRegularExpression
   - > (
   - > yourPhoneNumber varchar(60)
   - > );
Query OK, 0 rows affected (0.59 sec)

The query to create a trigger is as follows

mysql> DELIMITER //
mysql> CREATE TRIGGER enforce_phone_check BEFORE INSERT ON enforceDataUsingRegularExpression
   - > FOR EACH ROW
   - > BEGIN
   - > IF (NEW.yourPhoneNumber REGEXP '^(\\+?[0-9]{1,4}-)?[0-9]{3,10}$' ) = 0 THEN
   - > SIGNAL SQLSTATE '33455'
   - > SET MESSAGE_TEXT = 'Your Phone Number is incorrect';
   - > END IF;
   - > END //
Query OK, 0 rows affected (0.16 sec)
mysql> DELIMITER ;

Now look at the error when you insert record in the table to enforce data checking in MySQL using regular expression

mysql> insert into enforceDataUsingRegularExpression values("+55242-64576");
ERROR 1644 (33455): Your Phone Number is incorrect
mysql> insert into enforceDataUsingRegularExpression values("+76-WD1232221");
ERROR 1644 (33455): Your Phone Number is incorrect
Now inserting the correct data i.e. the correct phone, which is as follows:
mysql> insert into enforceDataUsingRegularExpression values("+55-1232221");
Query OK, 1 row affected (0.13 sec)

Display all records from the table using select statement.

The query is as follows

mysql> select *from enforceDataUsingRegularExpression;

The following is the output

+-----------------+
| yourPhoneNumber |
+-----------------+
| +55-1232221     |
+-----------------+
1 row in set (0.00 sec)