diff --git a/NEWS b/NEWS
index 57c20671..a60b007b 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,4 @@
+  - added simple math operators to variables (Monte)
   - reverted patch for case-insensitive tag-names (messju)
   - enabled array(&$obj. 'source', 'timestamp', 'secure', 'trusted')
     as callback for register_resource() (messju);
diff --git a/libs/Smarty_Compiler.class.php b/libs/Smarty_Compiler.class.php
index bd24ce79..3cd05980 100644
--- a/libs/Smarty_Compiler.class.php
+++ b/libs/Smarty_Compiler.class.php
@@ -112,7 +112,7 @@ class Smarty_Compiler extends Smarty {
 		// $foo[5][blah]
 		// $foo[5].bar[$foobar][4]
 		$this->_dvar_guts_regexp = '\w+(?:' . $this->_var_bracket_regexp
-				. ')*(?:\.\$?\w+(?:' . $this->_var_bracket_regexp . ')*)*';
+				. ')*(?:\.\$?\w+(?:' . $this->_var_bracket_regexp . ')*)*(?:\+\+|\-\-|(?:[\+\-\*\/]\d+(?:\.\d+)?))?';
 		$this->_dvar_regexp = '\$' . $this->_dvar_guts_regexp;
 
 		// matches config vars: