diff --git a/definitions/patterns_re.txt b/definitions/patterns_re.txt
index 1165e66..47a5f76 100644
--- a/definitions/patterns_re.txt
+++ b/definitions/patterns_re.txt
@@ -4,10 +4,13 @@ eval\/\*[a-z0-9]+\*\/
 #
 eval\([a-z0-9]{4,}\(\$[a-z0-9]{4,}, \$[0-9a-z]{4,}\)\);
 
-#
+# chr(101).chr(118).chr(97)
 (chr\(\d+\^\d+\)\.){4,}
 
-#
+# $_uU(101).$_uU(118).$_uU(97)
+(\$\_[a-z0-9]{2,}\(\d+\)\.){4,}
+
+# $uUx[101].$uUx[118].$uUx[97]
 (\$[a-z0-9]{3,}\[\d+\]\.){4,}
 
 #