Check if a string contains numbers

How do I check if a string in a MySQL field contains a number then delete them?

Example table:

tbl_tags
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| id | tag    |
 -------------
| 1  | hello 开发者_C百科 |
| 2  | hello2 |
| 3  | 2hello |
| 4  | hel3lo |
 -------------

The only way I can think of is to do each number individually and use LIKE '%1%' OR LIKE '%2%' etc. But there must be an easier way?

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Check out the MySQL Regex methods. Something like the following should work.

SELECT * FROM table WHERE tag REGEXP '[0-9]'

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SELECT * 
FROM clients
WHERE name REGEXP '^[[:digit:]]+$'
ORDER BY `clients`.`country_id` DESC 
LIMIT 0 , 30

this is the answer if you're looking for strings with only digits