conf: simplify ipv4 regex

use one matching group rather than 3.

src/conf.c

@@ -964,7 +964,7 @@ static HANDLE_FUNC (handle_upstream)
         ip = get_string_arg (line, &match[mi]);
         if (!ip)
                 return -1;
-        mi += 5;
+        mi += 3;
 
         port = (int) get_long_arg (line, &match[mi]);
         mi += 2;

src/conf_regex.h

@@ -16,7 +16,7 @@
 #define ALNUM "([-A-Za-z0-9._]+)"
 #define USERNAME "([^:]*)"
 #define PASSWORD "([^@]*)"
-#define IP "((([0-9]{1,3})\\.){3}[0-9]{1,3})"
+#define IP "([0-9]+[.][0-9]+[.][0-9]+[.][0-9]+)"
 #define IPMASK "(" IP "(/" DIGIT "+)?)"
 #define IPV6 "(" \
         "(([0-9a-fA-F:]{2,39}))|" \