r3117, r3123, r3229 merge: server name related merges: *) If .domain.com, .sub.domain.com, and .domain-some.com were defined, then .sub.domain.com was matched by .domain.com: wildcard names hash was built incorrectly due to sorting order issue of "." vs "-". They were sorted as com.domain com.domain-some com.domain.sub while they should be sorted as com.domain com.domain.sub com.domain-some for correct hash building *) test space between "~" and regex in server_name and invalid_referers *) do not run regex for empty host name since regex always fails in this case, the bug had been introduced in r2196

--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -3512,6 +3512,12 @@ ngx_http_core_server_name(ngx_conf_t *cf
         ngx_str_t  err;
         u_char     errstr[NGX_MAX_CONF_ERRSTR];
 
+        if (value[i].len == 1) {
+            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                               "empty regex in server name \"%V\"", &value[i]);
+            return NGX_CONF_ERROR;
+        }
+
         err.len = NGX_MAX_CONF_ERRSTR;
         err.data = errstr;