Google have launched a new tool, Code Search that can be used to find stuff in publicly available source code. A quick search on has_many reveals that the search giant has already indexed RubyForge, which could make example code much easier to find for those of us learning Ruby and Rails.
The advanced code search even allows searching using regular expressions, limiting searching to a given language or open source licence, and other options.
SecurityFocus have published an article warning that this tool may make it easier to find poorly written and vulnerable code. While that may be the case, the benefits of a more efficient code search tool will hopefully outweigh these concerns.
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