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Examples: ['a1', 'a11', 'a12', 'a2', 'a21'] => ['a1', 'a2', 'a11', 'a12','a21'] ['a', 'b', 'c', 'A', 'B', 'C'] => ['A', 'a', 'B', 'b', 'C', 'c'] ['x__2', 'x_1'] => ['x_1', 'x__2'] == Features: * sort case insensitive * sort filename matching pattern "abc1", "abc12", "abc2" in the correct order * sort underscore insensitive == Install: * sudo gem install naturalsort