[SilentSoul]

pawn Код:

CMD:rc(playerid,params[])
{
    new string[128];
    if(GetPVarInt(playerid, "Spawned") != 1)
    {
        SendClientMessage(playerid,COLOR_ERROR,"You must be alive and spawned in order to be able to use this command.");
        return 1;
    }
    if(pInfo[playerid][Regularlevel] != 1);
    {
        SendClientMessage(playerid,COLOR_ERROR,"Only Regular Players can use the Regular Player chat to talk.");
        return 1;
    }
    if(!strlen(params))
    {
        SendClientMessage(playerid,COLOR_ERROR,"USAGE: /rc (Message)");
        return 1;
    }
    format(string,sizeof(string),"[REGULAR CHAT] %s(%d): %s",GetPlayerNameEx(playerid),playerid,params);
    SendClientMessageToAllRegularsl(string);
    return 1;
}

And make stock for SendClientMessageToallregulars

EDIT : Scroll down to Emmet_ comment.