Change partial string on a field

I have a field 开发者_开发百科"my_data" with strings like these :

XX-12-XXXX
12-XX-2000
XX-XX-2000
XX-XX-XXXX

and I'd like to change every XX and XXXX with, respectively, 00 and 0000

How can I do it with a MySql query?

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Use the REPLACE function:

UPDATE myTable
SET my_data = REPLACE(my_date, 'XX', '00')

Note:

I am using XX as this will also replace XXXX, but not single occurrences of X.

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You cam use REPLACE() function:

UPDATE table
   SET my_data = REPLACE(my_data, 'X', '0');

SELECT REPLACE(my_data, 'X', '0') AS myData
  FROM table;