I am more and more impressed with Design Shack; it is a complete, accessible resource for web design. 
I encourage you to subscribe to one of the feeds, at least.
Carrie Cousins, in Design Shack, posts a great introduction to the considerations for designers in implementing the all-important search box within a website. She covers the need for a search box, its functionality, placement in the site and on the page, signals the box should provide to guide its use, and tips and resources for search box.
What Makes a Great Search Interface?
by Carrie Cousins on 26th February 2014
A search box is one of the essential pieces that is included in almost every website design. While sometimes the creation of this small element turns into an afterthought, there is no reason why the search box should not be designed as beautifully as the rest of a website.
The design of a search box should mirror that of the rest of the site, be functional and easy to use and be placed in a location that is obvious to users. Today, we are going to take a look at some great search boxes and a few tools to help you through your own design.
Post continues at link.