diff --git a/htdocs/core/db/DoliDB.class.php b/htdocs/core/db/DoliDB.class.php
index 3a2346c2356..1caa8d6dcdf 100644
--- a/htdocs/core/db/DoliDB.class.php
+++ b/htdocs/core/db/DoliDB.class.php
@@ -186,8 +186,8 @@ abstract class DoliDB implements Database
 	 */
 	public function sanitize($stringtosanitize, $allowsimplequote = 0, $allowsequals = 0, $allowsspace = 0, $allowschars = 1)
 	{
-		//$result = preg_replace('/[^0-9_\-\.,'.($allowschars ? '\p{L}' : '').($allowsequals ? '=' : '').($allowsimplequote ? "\'" : '').($allowsspace ? ' ' : '').']/ui', '', $stringtosanitize);
-		$result = preg_replace('/[^0-9_\-\.,'.($allowschars ? 'a-z' : '').($allowsequals ? '=' : '').($allowsimplequote ? "\'" : '').($allowsspace ? ' ' : '').']/i', '', $stringtosanitize);
+		$result = preg_replace('/[^0-9_\-\.,'.($allowschars ? '\p{L}' : '').($allowsequals ? '=' : '').($allowsimplequote ? "\'" : '').($allowsspace ? ' ' : '').']/ui', '', $stringtosanitize);
+		//$result = preg_replace('/[^0-9_\-\.,'.($allowschars ? 'a-z' : '').($allowsequals ? '=' : '').($allowsimplequote ? "\'" : '').($allowsspace ? ' ' : '').']/i', '', $stringtosanitize);
 
 		if ($allowsimplequote == 1) {
 			// Remove all quotes that are inside a string and not around
diff --git a/test/phpunit/FunctionsLibTest.php b/test/phpunit/FunctionsLibTest.php
index 7f585eed557..67c3e13b816 100644
--- a/test/phpunit/FunctionsLibTest.php
+++ b/test/phpunit/FunctionsLibTest.php
@@ -1954,7 +1954,7 @@ class FunctionsLibTest extends CommonClassTest
 		var_dump($s);
 		*/
 
-		//$s = natural_search("t.field", "KØB", 3);						// mode 3 is to provide a list of string separated with coma
-		//$this->assertEquals(" AND (t.field IN ('KØB'))", $s);
+		$s = natural_search("t.field", "KØB", 3);						// mode 3 is to provide a list of string separated with coma
+		$this->assertEquals(" AND (t.field IN ('KØB'))", $s);
 	}
 }