soundex with Russian launguage support

soundex.coffee

exports.rules = rules = []

exports.addRule = addRule = (from, to) ->
  rules.push {
    from: from
    to: to
  }

addRule /[aehiouy]/g, ''
addRule /[йуеёыахоэяиюьъ]/g, ''
addRule /[с]?тч/g, 'щ'
addRule /rl/g, 'r'
addRule /[bfpvw]/g, '1'
addRule /[бфпв]/g, '1'
addRule /[cgjkqsxz]/g, '2'
addRule /[цжкзсг]/g, '2'
addRule /[dt]/g, '3'
addRule /[дтщшч]/g, '3'
addRule /[l]/g, '4'
addRule /[л]/g, '4'
addRule /[mn]/g, '5'
addRule /[мн]/g, '5'
addRule /[r]/g, '6'
addRule /[р]/g, '6'
#remove dublicates
addRule /([0-9])(\1{1,})/g, '$1'

exports.soundex = soundex = (word) ->
  w = word.toLowerCase()
  for rule in rules
    w = w.replace rule.from, rule.to
  return w