[DR3AD]

Hum.. this code for example, I dont know if it works but test it


put it under OnPlayerConnect(playerid)

Код:

new name[32];
GetPlayerName(playerid, name, sizeof(name));
if(strfind(name, "_", true) == -1)
{
      SendClientMessage(playerid, -1, "Introduce a valid name in the format <FirstName_LastName>");
      Kick(playerid);
}

strfind is a function that will search in a string for a specific character or a word that you want
In this case, it will search for the "_" character in the name.. the "-1" its when he doesnt find the character