diff --git a/phpBB/includes/functions_admin.php b/phpBB/includes/functions_admin.php
index c0db64dbfb..92dcf60ee0 100644
--- a/phpBB/includes/functions_admin.php
+++ b/phpBB/includes/functions_admin.php
@@ -2549,17 +2549,24 @@ function view_log($mode, &$log, &$log_count, $limit = 0, $offset = 0, $forum_id
 			return;
 	}
 
-	$keywords = preg_split('#[\s+\-|*()]+#u', utf8_strtolower(preg_quote($keywords, '#')), 0, PREG_SPLIT_NO_EMPTY);
+	// Use no preg_quote for $keywords because this would lead to sole backslashes being added
+	// We also use an OR connection here for spaces and the | string. Currently, regex is not supported for searching (but may come later).
+	$keywords = preg_split('#[\s|]+#u', utf8_strtolower($keywords), 0, PREG_SPLIT_NO_EMPTY);
 	$sql_keywords = '';
 
 	if (!empty($keywords))
 	{
-		$keywords_pattern = '#' . implode('|', $keywords) . '#ui';
+		$keywords_pattern = array();
+
+		// Build pattern and keywords...
 		for ($i = 0, $num_keywords = sizeof($keywords); $i < $num_keywords; $i++)
 		{
+			$keywords_pattern[] = preg_quote($keywords[$i], '#');
 			$keywords[$i] = $db->sql_like_expression($db->any_char . $keywords[$i] . $db->any_char);
 		}
 
+		$keywords_pattern = '#' . implode('|', $keywords_pattern) . '#ui';
+
 		$operations = array();
 		foreach ($user->lang as $key => $value)
 		{