experimentally simplify highlight searching

include/functions.php

@@ -2864,15 +2864,9 @@
 
 				// http://stackoverflow.com/questions/4081372/highlight-keywords-in-a-paragraph
 
-				$also_query = '';
+				$elements = $xpath->query("//*/text()");
-				foreach(array(strtolower($word), strtoupper($word), ucfirst(strtolower($word))) as $word_cap) {
-					$also_query .= ' or contains(.,"'.$word_cap.'")' ;
-				}
-				$elements = $xpath->query('//*[contains(.,"'.$word.'")' . $also_query . ']');
-
-				foreach ($elements as $element) {
-					foreach ($element->childNodes as $child) {
 
+				foreach ($elements as $child) {
 					if (!$child instanceof DomText) continue;
 
 					$fragment = $doc->createDocumentFragment();
@@ -2891,8 +2885,7 @@
 
 					if (!empty($text)) $fragment->appendChild(new DomText($text));
 
-						$element->replaceChild($fragment, $child);
+					$child->parentNode->replaceChild($fragment, $child);
-					}
 				}
 			}
 		}