Add missing delimiter in preg_quote() occurences (fix #1929)
diff --git a/system/helpers/url_helper.php b/system/helpers/url_helper.php
index de5bdec..dc77246 100644
--- a/system/helpers/url_helper.php
+++ b/system/helpers/url_helper.php
@@ -489,7 +489,7 @@
 			$separator = '_';
 		}
 
-		$q_separator = preg_quote($separator);
+		$q_separator = preg_quote($separator, '#');
 
 		$trans = array(
 				'&.+?;'			=> '',