Regex in MySQL to Display Only Numbers Separated by Hyphen

Let us first create a table −

mysql> create table DemoTable
   (
      Code varchar(100)
   );
Query OK, 0 rows affected (1.16 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('100-677-9876');
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable values('100-677-9876-John');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable values('David-100-677-9876');
Query OK, 1 row affected (0.16 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+--------------------+
| Code               |
+--------------------+
| 100-677-9876       |
| 100-677-9876-John  |
| David-100-677-9876 |
+--------------------+
3 rows in set (0.00 sec)

Following is the Regex to display only numbers separated by hyphen −

mysql> select *from DemoTable where Code REGEXP '^\(?[0-9]{3}\)?[\s-]?[0-9]{3}[\s-]?[0-9]{4}$';

This will produce the following output −

+--------------+
| Code         |
+--------------+
| 100-677-9876 |
+--------------+
1 row in set (0.00 sec)