unescape

# File lib/yaml/encoding.rb, line 21
        def YAML.unescape( value )
                value.gsub( /\\(?:([nevfbart\\])|0?x([0-9a-fA-F]{2})|u([0-9a-fA-F]{4}))/ ) { |x| 
                        if $3
                                ["#$3".hex ].pack('U*')
                        elsif $2
                                [$2].pack( "H2" ) 
                        else
                                UNESCAPES[$1] 
                        end
                }
        end