Javascript optgroup[label=] with special character

I have a problem with javascript for an Oracle APEX Report and I cant find the answer.

Im trying to do:

prompt($('#obs_ir_oot_objecten_saved_reports optgroup[label="Priv\é"] option').length);

This results in 0 But the optgroup has options in it

<optgroup label="Privé">
 <option value="19580268757611765">1. Test</option>
 <option value="19596594240127860">2. Test G</option>
 <option value="19580521094630982">3. Test 1</option>
 <option value="19581084888635942">4. Test 2</option>
 <option value="19585119906724784">5. Test 3</option>
</optgroup>

Other optgroups with out a special characters work fine using a \ or not before the é makes no difference. A I missing something? I hope somebody knows the answer.

Solution

optgroup[label*="Priv"] solved the problem.

Thank you.