+function hostport(val)
+ local h, p = val:match("^([^:]+):([^:]+)$")
+ return not not (h and p and host(h) and port(p))
+end
+
+function ipaddrport(val)
+ local h, p = val:match("^([^:]+):([^:]+)$")
+ return not not (h and p and ipaddr(h) and port(p))
+end
+