import re 
def PreProcess(sentence,edcode="utf-8"): 
 sentence = sentence.decode(edcode) 
 sentence=re.sub(u"[。，,－…!《》<>\"':：？\?、\|“”‘'；]"," ",sentence) 
 return sentence 
def FMM(sentence,diction,result = [],maxwordLength = 4,edcode="utf-8"):
 i = 0 
 sentence = PreProcess(sentence,edcode) 
 length = len(sentence) 
 while i < length: 
  # find the ascii word 
  tempi=i 
  tok=sentence[i:i+1] 
  while re.search("[0-9A-Za-z\-\+#@_\.]{1}",tok)<>None: 
   i= i+1 
   tok=sentence[i:i+1] 
  if i-tempi>0: 
   result.append(sentence[tempi:i].lower().encode(edcode)) 
  # find chinese word 
  left = len(sentence[i:]) 
  if left == 1: 
   """go to 4 step over the FMM""" 
   """should we add the last one? Yes, if not blank""" 
   if sentence[i:] <> " ": 
    result.append(sentence[i:].encode(edcode)) 
   return result 
  m = min(left,maxwordLength) 
  for j in xrange(m,0,-1): 
   leftword = sentence[i:j+i].encode(edcode) 
   # print leftword.decode(edcode) 
   if LookUp(leftword,diction): 
    # find the left word in dictionary 
    # it's the right one 
    i = j+i 
    result.append(leftword) 
    break 
   elif j == 1: 
    """only one word, add into result, if not blank""" 
    if leftword.decode(edcode) <> " ": 
     result.append(leftword) 
    i = i+1 
   else: 
    continue 
 return result 
def LookUp(word,dictionary): 
 if dictionary.has_key(word): 
  return True 
 return False 
def ConvertGBKtoUTF(sentence): 
 return sentence.decode('gbk').encode('utf-8')
dictions = {} 
dictions["ab"] = 1 
dictions["cd"] = 2 
dictions["abc"] = 1 
dictions["ss"] = 1 
dictions[ConvertGBKtoUTF("好的")] = 1 
dictions[ConvertGBKtoUTF("真的")] = 1 
sentence = "asdfa好的是这样吗vasdiw呀真的daf dasfiw asid是吗？" 
s = FMM(ConvertGBKtoUTF(sentence),dictions) 
for i in s: 
 print i.decode("utf-8")
test = open("test.txt","r") 
for line in test: 
 s = FMM(CovertGBKtoUTF(line),dictions) 
 for i in s: 
  print i.decode("utf-8")