--- reg
+++ reg
@@ -58,6 +58,9 @@
 
 <token: array>
   (?: <.begin_array> (?: (?: <[value]> (?: (?: <.value_separator><[value]> ) )*  ) )? <.end_array> )
+    (?{
+    $MATCH = $MATCH{value} ;
+    })
 
 <token: number>
   (?:  (?: <minus> )? <int> (?: <frac> )?  (?: <exp> )?  )