diff --git a/sources/application/search/criterionconversion/criteriontosearchform.class.inc.php b/sources/application/search/criterionconversion/criteriontosearchform.class.inc.php
index f27595b369..bf67fd1003 100644
--- a/sources/application/search/criterionconversion/criteriontosearchform.class.inc.php
+++ b/sources/application/search/criterionconversion/criteriontosearchform.class.inc.php
@@ -73,7 +73,8 @@ class CriterionToSearchForm extends CriterionConversionAbstract
 
 		foreach($aAndCriterionRaw as $aCriteria)
 		{
-			$aCriteria['label'] = trim($aCriteria['label'], "()");
+			$aCriteria['label'] = preg_replace("@^\(@", '', $aCriteria['label']);
+			$aCriteria['label'] = preg_replace("@\)$@", '', $aCriteria['label']);
 			$aCriteria['is_removable'] = $bIsRemovable;
 
 			// Check criteria validity