juis_check: make it work on MacOS X again (#20)

* juis_check: workaround for 'expr' error on BSD systems ...

if a regex quantifier (+) is used

* juis_check: more trouble with 'expr' on BSD systems

juis/juis_check

@@ -1119,7 +1119,7 @@ replace_in_file()
 #######################################################################################################
 get_decimal_value()
 (
-	expr "$1" : "0*\([0-9]\+\)"
+	expr "$1" : "0*\([1-9]*[0-9]\)"
 )
 #######################################################################################################
 #                                                                                                     #
@@ -1149,7 +1149,7 @@ split_version_number()
 			else
 				s=0
 			fi
-		elif [ -z "$(expr \( "$c" : "\([A-Za-z]\)" \) )" ]; then
+		elif [ "$c" = "-" ] || [ -z "$(expr \( "$c" : "\([A-Za-z]\)" \) )" ]; then
 			if [ "$c" = "[" ]; then
 				o=1
 			elif [ "$c" = "]" ]; then