diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index e6b1162a0..b88df336b 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -3507,16 +3507,16 @@ ngx_http_core_server_name(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
         sn->server = cscf;
         sn->name = value[i];
 
-        ngx_strlow(sn->name.data, sn->name.data, sn->name.len);
-
         if (value[i].data[0] != '~') {
+            ngx_strlow(sn->name.data, sn->name.data, sn->name.len);
             continue;
         }
 
 #if (NGX_PCRE)
         {
-        ngx_regex_compile_t  rc;
-        u_char               errstr[NGX_MAX_CONF_ERRSTR];
+        u_char               *p;
+        ngx_regex_compile_t   rc;
+        u_char                errstr[NGX_MAX_CONF_ERRSTR];
 
         if (value[i].len == 1) {
             ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
@@ -3533,6 +3533,13 @@ ngx_http_core_server_name(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
         rc.err.len = NGX_MAX_CONF_ERRSTR;
         rc.err.data = errstr;
 
+        for (p = value[i].data; p < value[i].data + value[i].len; p++) {
+            if (*p >= 'A' && *p <= 'Z') {
+                rc.options = NGX_REGEX_CASELESS;
+                break;
+            }
+        }
+
         sn->regex = ngx_http_regex_compile(cf, &rc);
         if (sn->regex == NULL) {
             return NGX_CONF_ERROR;