Need help finding a way to make a search for whole website


For many hours I browsed the web to find a solution for a simple functionnal search bar.
I want a search that just return a link to pages corresponding to the keywords.
I tried to find some php scripts but didn’t satisfy my expectations because it’s usually doing some mysql querry to a database, but I just want to search some html content !

I’m lost, any idea what i can do ?