[zSuYaNw]

This function check caracter by caracter:

PHP код:

for(new i; string[i]; ++i){
     if(string[i] == '~'){
         break;
     }
}

if(string[i] != EOS){
     return SendClientMessage(playerid, COLOR_RED, "Can't use in /cnn or /cnnn '~' ");
} 


you can test it?