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Message: [QUOTE="Dave Burt, post: 4508562"] Jeroen Heijmans asked: tr comes from Perl, where it has the meaning of PHP's three-argument version of strtr(), which is the same as Ruby's tr. The two argument version, with the arrays, isn't in standard Ruby, but to get equivalent functionality, you'd have to do something like this: class String # PHP's two argument version of strtr def strtr(replace_pairs) keys = replace_pairs.map {|a, b| a } values = replace_pairs.map {|a, b| b } self.gsub( /(#{keys.map{|a| Regexp.quote(a) }.join( ')|(' )})/ ) { |match| values[keys.index(match)] } end end # Call using a hash for the replacement pairs: "AA BB".strtr("AA" => "BB", "BB" => "AA") #=> "BB AA" # Or use an array of pairs if order matters "AA BB".strtr([["AA", "BB"], ["BB", "AA"]]) #=> "BB AA" Cheers, Dave [/QUOTE]