diff --git a/server/WebApi.cpp b/server/WebApi.cpp
index 96a49c04..f13fd4f4 100755
--- a/server/WebApi.cpp
+++ b/server/WebApi.cpp
@@ -1749,8 +1749,12 @@ void installWebApi() {
         CHECK(!offer.empty(), "http body(webrtc offer sdp) is empty");
         std::string host = allArgs.getParser()["Host"];
         std::string localIp = host.substr(0, host.find(':'));
-        std::regex ipv4Regex("^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$");
-        if (!std::regex_match(localIp, ipv4Regex)||localIp=="127.0.0.1") {
+
+        auto isVaildIP = [](std::string ip)-> bool {
+            int a,b,c,d;
+            return sscanf(ip.c_str(),"%d.%d.%d.%d", &a, &b, &c, &d) == 4;
+        };
+        if (!isVaildIP(localIp) || localIp=="127.0.0.1") {
             localIp = "";
         }