Stock Recommendation Overview

When the User visits the website he will be able to type into a search bar the ticker or stock he wants analyzed. The app needs to:

1. Make sure the stock/ticker he enters is valid
2. Suggest him tickers/stocks which match with his input while he’s still typing in real time. This is essential because I want users to be able to enter a stock name and not only a ticker. Since stock names aren’t all formatted the same I have to match the users input with known stocks so he doesn’t have to perfectly enter everything.

How does one do that?