Internet portal Yahoo Inc. released a Search Builder tool for creating customized search engines, rivaling many search upstarts, on Monday

The new tool will let users define the scope of their search, allowing them to include anywhere from one, to the entirety of Yahoo's index. News searches can also be included, the company said.

The Search Builder will generate code that web-site operators can easily integrate into their own site, making it easy for developers to add specialized search functionality to their projects.

The service additionally provides tools for analyzing search traffic. A popular search module shows the top searches being performed, while user and traffic reports help track growth.