[bogeymanEST]

Use

pawn Код:

if(strfind(insert_new_name_string_here, "&") != -1 || 
strfind(insert_new_name_string_here, "$") != -1 || 
strfind(insert_new_name_string_here, "^") != -1 || 
strfind(insert_new_name_string_here, "@") != -1) return SendClientMesssage(playerid, 0xFF0000FF, "Invalid characters!"); 
//Here goes your code to change the nick.