Index: trunk/data/tagchecker.cfg
===================================================================
--- trunk/data/tagchecker.cfg	(revision 6185)
+++ trunk/data/tagchecker.cfg	(revision 6186)
@@ -18,5 +18,5 @@
 #
 # Key and value are expressions describing certain keys and values of these keys.
-# Regulator expressions are supported. In this case the expressions starts and
+# Regular expressions are supported. In this case the expressions starts and
 # ends with a / sign. If an 'i' is appended, the regular expression is
 # case insensitive. For instance, /foo|bar/i
@@ -85,4 +85,6 @@
 *    : W : natural == water && leisure == swimming_pool       # natural water used for swimming pool
 *    : W : natural == water && amenity == swimming_pool       # natural water used for swimming pool
+
+*    : W : /\d+/ == *                                         # numerical key
 
 ########################################