Check harder for missing closing bracket

sanityCheck

@@ -35,7 +35,7 @@ $GREP "<<[ ]*[^\$><_\[]*\(activeSlave\|PC\)[.]"  -- "src/*" | myprint "MissingDo
 # Check for closing bracket without opening bracket.  e.g.:  <<if foo)>>      (but  <<case "foo")>>   is valid, so ignore those
 $GREP -e "<<[ a-zA-Z]\+\([^()<>]\|[^()<>][<>][^()<>]\)*)" --and --not -e "<< *case"  -- "src/*" | myprint "MissingOpeningBracket"
 # Check for opening bracket without closing bracket.  e.g.:  <<if (foo>>
-$GREP -e "<<[ a-zA-Z]\+([^()<>]*>>" -- "src/*" | myprint "MissingClosingBracket"
+$GREP -e "<<[ a-zA-Z]\([^<>]\|[^<>][<>][^<>]\)\+(\([^()<>]\|[^<>()][<>][^<>()]\|([^<>()]*])\)*>>" -- "src/*" | myprint "MissingClosingBracket"
 # Check for two closing brackets but one opening bracket.  e.g.:  <<if (foo))>>
 $GREP -e "<<[ a-zA-Z]\+[^()<>]*([^()]*)[^()]*)[^()<>]*>>"  -- "src/*" | myprint "MissingOpeningBracket2"
 # Check for one closing bracket but two opening brackets.  e.g.:  <<if ((foo)>>