[Tee]

So i think then the command could be like this:

pawn Код:

if(strcmp(cmdtext, "/showmyname", true) == 0)
{
    new name[MAX_PLAYER_NAME, str[64];
    GetPlayerName(playerid, name, sizeof(name));
    if(strfind(name,"_",true) == -1)return SendClientMessage(playerid,0xFF0000FF,"Your name must include an underscore for this command to work. Ex Ihsan_Cingisiz");
    name[strfind(name,"_")] = ' ';
    format(str, sizeof(str), "Your name is: %s", name);
    SendClientMessage(playerid, 0xFFFFFFFF, str);
    return 1;
}

I am not good at strfind, i only used it twice in my server for restricting players to deposit or withdraw negative cash from bank.

Not tested.