Auto search from existing data

I have existing data in a file that I need to make work with my existing auto search script I currently use. I need it to search a large file. I will provide all the details. If you have questions please ask. You aren’t building any auto search script I already have that I only need you to integrate what I already have to search the data that I already have. This should be simple for a decent programmer. The site is in Wordpress and auto search is using php. It’s search different data not posts or pages but a cities database.