- #!/usr/bin/env python
- #encoding:utf8
- def next(pattern):
- p_len = len(pattern)
- pos = [-1]*p_len
- j = -1
- for i in range(1, p_len):
- while j > -1 and pattern[j+1] != pattern[i]:
- j = pos[j]
- if pattern[j+1] == pattern[i]:
- j = j + 1
- pos[i] = j
- return pos
- def kmp(ss, pattern):
- pos = next(pattern)
- ss_len = len(ss)
- pattern_len = len(pattern)
- j = -1
- for i in range(ss_len):
- while j > -1 and pattern[j+1] != ss[i]:
- j = pos[j]
- if pattern[j+1] == ss[i]:
- j = j + 1
- if j == pattern_len-1:
- print 'matched @: %s' % str(i-pattern_len+1)
- j = pos[j]
- kmp(u'上海自来水来自海上海', u'上海')
- #该片段来自于http://www.codesnippet.cn/detail/160420132823.html
来源: http://www.codesnippet.cn/detail/160420132823.html