diff --git a/server/cardnet.cpp b/server/cardnet.cpp
index 2c9d6ae..757dc32 100644
--- a/server/cardnet.cpp
+++ b/server/cardnet.cpp
@@ -1,11 +1,11 @@
 /*
 Compiler: g++
-Flags: -static-libgcc -static-libstdc++ -lws2_32
+Flags: -std=c++11 -static-libgcc -static-libstdc++ -lws2_32
 
 TODO:
-Do not send auto reply
+Fix regex validation, should be 16 character hexadecimal starting with e004
+Fix validation for file checker file
 Change card0.txt file based on information given by client
-
 */
 
 #include <iostream>
@@ -13,6 +13,7 @@ Change card0.txt file based on information given by client
 #include "argh.h"
 #include <winsock2.h>
 #include <stdio.h>
+#include <regex>
 
 #pragma comment(lib,"ws2_32.lib") //Winsock Library
 
@@ -229,6 +230,31 @@ int main (int argc, char* argv[])
                     //add null character, if you want to use with printf/puts or other string handling functions
                     buffer[valread] = '\0';
                     printf("%s:%d - %s \n" , inet_ntoa(address.sin_addr) , ntohs(address.sin_port), buffer);
+
+                    // the 'buffer' is the string to use to edit our card0.txt file
+                    
+                    // check if the check file exists
+                    //if(std::ifstream(check))
+                    //{
+                        // check file exists, rewrite 
+                        // regex to validate buffer is a e004 hex number
+                        std::regex cardRegex("[eE]004[0-9a-fA-F]{12}");
+                        if(std::regex_match(buffer, cardRegex))
+                        {
+                            std::cout << "Data recieved is a valid game card" << std::endl;
+                        }
+                        else
+                        {
+                            std::cout << "Data recieved is not a valid game card" << std::endl;
+                        }
+                    //}
+                    //else
+                    //{
+                        // no check file
+                    //    std::cout << "No check file! Will not re-write: " << file << std::endl;
+                    //}
+
+
                     send( s , buffer , valread , 0 );
                 }
             }
diff --git a/server/cardnet.exe b/server/cardnet.exe
index 1ed6032..bfa9c69 100755
Binary files a/server/cardnet.exe and b/server/cardnet.exe differ