diff --git a/sanityCheck b/sanityCheck
index af68ab23589a494a7b318634e89c521697f20551..a6b616acf2a936cf1110bb50805f5b1cf7363083 100755
--- a/sanityCheck
+++ b/sanityCheck
@@ -33,7 +33,7 @@ $GREP -e "@@color:" --and --not -e  "@@color:rgb([0-9 ]\+,[0-9 ]\+,[0-9 ]\+)" --
 # Check for missing $ in activeSlave or PC
 $GREP "<<[ ]*[^\$><_\[]*\(activeSlave\|PC\)[.]"  -- "src/*" | myprint "MissingDollar"
 # Check for closing bracket without opening bracket.  e.g.:  <<if foo)>>      (but  <<case "foo")>>   is valid, so ignore those
-$GREP -e "<<[ a-zA-Z]\+[^()<>]*)" --and --not -e "<< *case"  -- "src/*" | myprint "MissingOpeningBracket"
+$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"
 # Check for two closing brackets but one opening bracket.  e.g.:  <<if (foo))>>