\d does not work on some grep dist

bash/bashrc/rbashrc

@@ -181,7 +181,7 @@ function rbash-list {
     echo "Available sources:"
 	local _k
     for i in `__download "$RBASH_REMOTE/api/v1/repos/$RBASH_REPO/contents/$RBASH_PATH/sources/" | jq -r '.[].name'`; do
-		_k=`echo -n $i | grep -o "^\d\+"`
+		_k=`echo -n $i | grep -o "^[0-9]\+"`
 		_RBASH_DICT["s$_k"]=$i
         grep -q -e "^rbash_load \"sources/$i\"\$" "$RBASH_CONFIG"
         if [ $? -eq 0 ]; then