MySql Escaped \ and ' in a Like statement don't work

Question

I want to do a simple SELECTand LIKE statements in MySql 5.5.30. The data i'm looking for is a text presented like this in the database : Test d\'un article.

I searched how to escape \' and found that i must escape each character. I do the following:

SELECT
    description
FROM
    myTable
WHERE
    description
LIKE
    '%\\\'%'

This query works just fine and returns the data i want. But if I look for the entire text like this :

LIKE
    'Test d\\\'un article'

The query returns no result. I found out that the problem is from the d before the backslashes, as the following query works too

LIKE
    '%\\\'un article'

and this one don't

LIKE
    '%d\\\'%'

I couldn't find any similar problem elsewhere and hope you can help me with this.

PS. : The table charset is latin1_swedich_ci and the engine is MyISAM

Answer 1

The problem is that in LIKE, you've to double escape the backslashes. So following query will work

SELECT
    description
FROM
    myTable
WHERE
    description
LIKE
    '%d\\\\\'un article%'

in '%d\\\\\'un article%', first \\\\ is double escaping of \, and \' is escaping of '

related SO question:
Why I need to double-escape (use 4 \) to find a backslash ( \ ) in pure SQL?