search and replace french characters

Hello… after updating today, one of my plugins stopped working (wpboxer) and now I want to search/replace all the post content that refer to that plugin and remove it….. problem is that I’m trying to search for content that has some French characters in it, and both phpmyadmin and the WP search/replace plugins I’ve tried, will not find it…. though in the database I can see it there, and try to search exactly for what I can see in the database, it still can’t find it:

I have to remove this complete text from over 100 posts:

<h2>Design d’intérieur / Interior Design</h2>
[box set=”interiors”]
<div style=”clear: both;”></div>
<h2>Reproductions encadrées / Framed Prints</h2>
[box set=”frames”]

this is the query I’ve used in php….

UPDATE wp_zkgn9p_posts SET post_content = REPLACE (
post_content,
‘<h2>Design d’intérieur / Interior Design</h2>
[box set=”interiors”]
<div style=”clear: both;”></div>
<h2>Reproductions encadrées / Framed Prints</h2>
[box set=”frames”]’,
‘ ‘);

which finds nothing, and tells me:

#1064 – You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘intérieur / Interior Design</h2> [box set="interiors"] <div style="clear: bot’ at line 3

I tried to understand the character encoding, and it’s way over my head…. can you help please?

thank you,