Hi assa77, Your English is OK, by me. DOS uses (and the Windows DOS emulator still uses today), the command "find", for this, but I'm not sure if it has the performance you need, or not.
I'm no expert on this at all, so take this with caution, but I think "find" just uses a relatively simple approach, opening the file in binary mode, and racing through from start to finish. Just to be clear on this, are you looking for a string value of "I want this", only, or are you also wanting to seach for every case of "I" and "want" and "this", or do you want every case of an "I", or a "w", or an "a", or an "n", etc. ? Have you checked out using a hash table for this? Quite a challenge, here! adak
