Done using regex

Author: gs146

Validate IP address

@@ -0,0 +1,19 @@
+class Solution {
+public:
+    string validIPAddress(string IP) 
+    {
+        regex v4("(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])");
+        
+         // regex v4("(([0-9] |[1-9][0-9]| 1[0-9][0-9] | 2[0-4][0-9]|25[0-5])\\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])");
+        
+        if(regex_match(IP,v4)==true)
+            return "IPv4";
+        
+        regex ipv6("((([0-9a-fA-F]){1,4})\\:){7}(([0-9a-fA-F]){1,4})");
+        
+        if(regex_match(IP,ipv6))
+            return "IPv6";
+        
+        return "Neither";
+    }
+};