[RajatPawar]

pawn Код:

stock IsPlayerCorrectlyNamed( playerid )
{
     new pNAME[MAX_PLAYER_NAME]; GetPlayerName( playerid, pNAME, MAX_PLAYER_NAME );
     for( new i = 0 ; i < 10 ; i++ )
     {
          if(strfind(name, i, true) != -1 ) return Kick( playerid );
      }
      if( strfind(name, "_", true) == -1) return Kick( playerid );
      else return 1;
}

This COULD work. I have never tried this function before, it should probably work. You can add whatever other symbols you need like "@, ]" to be checked.