MDL-55357 search: Contents include UTF8 characters, adding u modifier

course/tests/search_test.php

@@ -123,7 +123,7 @@ class course_search_testcase extends advanced_testcase {
         $this->assertEquals($course->fullname, $doc->get('title'));
 
         // Not nice. Applying \core_search\document::set line breaks clean up.
-        $summary = preg_replace("/\s+/", " ", content_to_text($course->summary, $course->summaryformat));
+        $summary = preg_replace("/\s+/u", " ", content_to_text($course->summary, $course->summaryformat));
         $this->assertEquals($summary, $doc->get('content'));
         $this->assertEquals($course->shortname, $doc->get('description1'));
     }

search/classes/document.php

@@ -277,7 +277,7 @@ class document implements \renderable, \templatable {
             $this->data[$fieldname] = intval($value);
         } else {
             // Replace all groups of line breaks and spaces by single spaces.
-            $this->data[$fieldname] = preg_replace("/\s+/", " ", $value);
+            $this->data[$fieldname] = preg_replace("/\s+/u", " ", $value);
         }
 
         return $this->data[$fieldname];