Can't STOP when I want to use longest match

[fseasy]

Hi, I came across a bug when use longest_match as README.rst introductions to do greedy search for the longest matching keywords.

the longest_match did as README,

    def _longest_match(matches):
        spos_groupby_iter = groupby(matches, itemgetter(1)) # by spos
        for _, kw_iter_with_same_spos in spos_groupby_iter:
            l = list(kw_iter_with_same_spos)
            print(l)
            yield max(l) # max get the longest keyword

It can never stop when I match a sentence like

因为弱覆盖

（sorry for use Chinese because time is too less to construct a English case）and word dict has words like

覆盖
弱覆盖

. What's more, the following 2 conditions will not raise the BUG:

1. text 弱覆盖 is not the end of the text.

   like sentence = 因为弱覆盖的原因

2. use list, instead of iterator.

   def _longest_match(matches):
       pre_get_list = list(matches) # get the list instead of the iterator
       spos_groupby_iter = groupby(pre_get_list, itemgetter(1)) # by spos
       for _, kw_iter_with_same_spos in spos_groupby_iter:
           l = list(kw_iter_with_same_spos)
           print(l)
           yield max(l) # max get the longest keyword
   

SO may be it is because of not a proper StopIteration is raised? SORRY for I can't help currenttly. What I can do is only report the bug...

I use unicode as str representation, In Python2, CentOS7.2

[scoder]

Thanks for your report. It suggests that it might be mishandling the case that the last match occurs at the end of the input string.