POSIX classes are intended for use within character classes, so you use them within square brackets. : End With « Regular Expression « SQL / MySQL

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POSIX classes are intended for use within character classes, so you use them within square brackets.

      
mysql>
mysql> CREATE TABLE mytable
    -> (
    ->  name    VARCHAR(20)
    -> );
Query OK, 0 rows affected (0.01 sec)

mysql> INSERT INTO mytable (name)
    ->  VALUES
    ->          ('copper'),
    ->          ('gold'),
    ->          ('iron'),
    ->          ('lead'),
    ->          ('mercury'),
    ->          ('platinum'),
    ->          ('silver'),
    ->          ('tin')
    -> ;
Query OK, 8 rows affected (0.00 sec)
Records: 8  Duplicates: 0  Warnings: 0

mysql>
mysql> SELECT * FROM mytable;
+----------+
| name     |
+----------+
| copper   |
| gold     |
| iron     |
| lead     |
| mercury  |
| platinum |
| silver   |
| tin      |
+----------+
8 rows in set (0.00 sec)

mysql>
mysql> SELECT name, name REGEXP '[[:xdigit:]]' FROM mytable;
+----------+----------------------------+
| name     | name REGEXP '[[:xdigit:]]' |
+----------+----------------------------+
| copper   |                          1 |
| gold     |                          1 |
| iron     |                          0 |
| lead     |                          1 |
| mercury  |                          1 |
| platinum |                          1 |
| silver   |                          1 |
| tin      |                          0 |
+----------+----------------------------+
8 rows in set (0.00 sec)

mysql>
mysql> drop table mytable;
Query OK, 0 rows affected (0.00 sec)

   
    
    
    
    
    
  

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