Google Code Search
Google Code Search indexes contents of zip and tarball files and best of all, you can use regular expressions in the query field when searching, as seen in the screenshot from the search page (above). One thing I noticed was the conventient search language feature, but it’s convenient only for certain languages. All the expected big boys work, searching for lang: and c, c++, c#, java, jsp and even javascript return plenty of hits. Oddly lang:asp works but lang:vb, vb.net, or visualbasic all return nada. I guess there’s another reason to use c# instead of vb. via: techcrunch