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> "([A-Z][a-z]+){7,} lang:java

Yeah this one was my favorite of the code search examples, there are some really good ones in there.

Can you explain this? It looks to me like a regexp that searches Java source for words 7+ characters that start with a capital letter?

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.

This searches for camelcase identifiers with at least 7 words.

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