Bug #7112 ยป ruby_file_extname.patch
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* File.extname(path) -> string
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*
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* Returns the extension (the portion of file name in <i>path</i>
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* after the period).
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* starting from the last period).
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*
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* File.extname("test.rb") #=> ".rb"
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* File.extname("a/b/d/test.rb") #=> ".rb"
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