diff --git a/NoSteamManager/scripting/NoSteamManager.sp b/NoSteamManager/scripting/NoSteamManager.sp
index 7f763f1b..c24b834d 100644
--- a/NoSteamManager/scripting/NoSteamManager.sp
+++ b/NoSteamManager/scripting/NoSteamManager.sp
@@ -3,6 +3,7 @@
 #include <sourcemod>
 #include <basecomm>
 #include <connect>
+#include <regex>
 
 #pragma newdecls required
 
@@ -11,6 +12,9 @@ ConVar g_hCvar_BlockAdmin;
 ConVar g_hCvar_BlockVoice;
 ConVar g_hCvar_BlockSpoof;
 
+/* REGEX */
+Regex g_hReg_ValidateSteamID;
+
 //----------------------------------------------------------------------------------------------------
 // Purpose:
 //----------------------------------------------------------------------------------------------------
@@ -27,6 +31,8 @@ public Plugin myinfo =
 //----------------------------------------------------------------------------------------------------
 public void OnPluginStart()
 {
+	g_hReg_ValidateSteamID = CompileRegex("[^STEAM_[01]:[01]:\\d{1,10}]");
+
 	g_hCvar_BlockAdmin = CreateConVar("sm_nosteam_block_admin", "1", "Should people marked as nosteam be blocked from admin?", FCVAR_NONE, true, 0.0, true, 1.0);
 	g_hCvar_BlockVoice = CreateConVar("sm_nosteam_block_voice", "1", "Should people marked as nosteam be blocked from voice?", FCVAR_NONE, true, 0.0, true, 1.0);
 	g_hCvar_BlockSpoof = CreateConVar("sm_nosteam_block_spoof", "1", "Block nosteam people being able to spoof steamids.",     FCVAR_NONE, true, 0.0, true, 1.0);
@@ -184,6 +190,9 @@ public void OnClientPutInServer(int client)
 	char sSteamID[32];
 	GetClientAuthId(client, AuthId_Steam2, sSteamID, sizeof(sSteamID));
 
+	if(MatchRegex(g_hReg_ValidateSteamID, sSteamID) <= 0)
+		return;
+
 	for(int player = 1; player <= MaxClients; player++)
 	{
 		if(client == player || !IsClientConnected(player))
@@ -195,12 +204,16 @@ public void OnClientPutInServer(int client)
 		char sPlayerSteamID[32];
 		GetClientAuthId(player, AuthId_Steam2, sPlayerSteamID, sizeof(sPlayerSteamID));
 
+		if(MatchRegex(g_hReg_ValidateSteamID, sPlayerSteamID) <= 0)
+			continue;
+
 		if(StrEqual(sSteamID, sPlayerSteamID, false))
 		{
 			if(!SteamClientAuthenticated(sSteamID))
 			{
 				LogMessage("%L was not authenticated with steam, steamid already connected. Kicking connector.", client);
 				KickClient(client, "Please come back later.");
+
 				return;
 			}
 
@@ -208,6 +221,7 @@ public void OnClientPutInServer(int client)
 			{
 				LogMessage("%L was not authenticated with steam, steamid already connected. Kicking connected.", player);
 				KickClient(player, "Please come back later.");
+
 				return;
 			}