From: Lloyd Linklater <lloyd@2live4.com>
Date: 2008-09-03T23:09:05+09:00
Subject: Re: How to match words that rhyme?

Here is a crude start based on an old version I wrote in Pascal.  It 
should give you a place to start.   (Please do not be TOO brutal in 
critique.  I am new with writing Ruby algorithms. Elegance will come.)

class Soundex
  def soundsAlike word1, word2
    soundex(word1) == soundex(word2)
  end

  def soundex w
    w.upcase!
    temp1 = w[0,1]
    1.upto(w.length - 1) { |i|
      case w[i, 1]
      when 'B','F','P','V'
        temp1 += '1'
      when 'C','G','J','K','Q','S','X','Z'
        temp1 += '2'
      when 'D','T'
        temp1 += '3'
      when 'L'
        temp1 += '4'
      when 'M', 'N'
        temp1 += '5'
      when 'R'
        temp1 += '6'
      end
    }
    i = 1
    while i < temp1.length - 1 do
      if temp1[i] == temp1[i + 1]
        temp1[i] = ''
      else
        i += 1
      end
    end
    temp1
  end
end

s = Soundex.new
p s.soundsAlike('their', 'there')  # returns true
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