diff --git a/shell_map.sh b/shell_map.sh
index ceb711c..d52a655 100755
--- a/shell_map.sh
+++ b/shell_map.sh
@@ -34,7 +34,7 @@ shell_map () {
         printf '%s' "${!VALUE}"
     ;;
     keys)
-        declare | grep -Po "(?<=${FUNCNAME}_DATA_)\w+((?=\=))"
+        declare | grep -o "${FUNCNAME}_DATA_[^=]*" | sed "s/^${FUNCNAME}_DATA_//"
     ;;
     name)
         echo $FUNCNAME