It searches for CamelCase identifiers that are made of seven or more "terms", where each term is a capital letter followed by one or more lowercase letters. E.

It searches for CamelCase identifiers that are made of seven or more "terms", where each term is a capital letter followed by one or more lowercase letters. E.g., ProjectPotatoLoginPageBuilderFactoryObserver. (Disclaimer: I just made it up. Not an actual Google project name.) "lang: java" is not a part of regexp; just a Google code search extension that searches for Java.