HELP HELP on a file parser

I need some help, I think this is probably really simple and I was wondering if anyone had some code I could use to help me write this. I need a page to parse a text file with a list of numbers, and then take those numbers and parse another file with over 7MB of information and to look for those numbers and then to pull out the matches. Now the file that its looking through each record that has a number in it is in a specific format with a beginnning and an end. Any help would be appreciated. _________________________________________________________________ STOP MORE SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail