=== modified file 'data.awk'
--- data.awk	2014-05-26 09:10:52 +0000
+++ data.awk	2014-01-13 21:00:08 +0000
@@ -27,10 +27,10 @@
 	next
 }
 
-/^del[ \t].*[a-zA-Z_][a-zA-Z0-9_.]$/ {
+/^del[ \t].*[$/ {
 	del_pattern = substr($0, 5)
 	for(varname in V) {
-		if (match(varname, del_pattern)) {
+		if match(varname, del_pattern) {
 			delete V[varname]
 		}
 	}