模式匹配，kmp算法,kmp算法是一种改进的字符串匹配算法，由D.E.Knuth与V.R.Pratt和J.H.Morris同时发现，因此人们称它为克努特——莫里斯——普拉特操作（简称KMP算法）。KMP算法的关键是根据给定的模式串W1,m,定义一个next函数。next函数包含了模式串本身局部匹配的信息。-Pattern matching, kmp algorithm, kmp algorithm is an improved string matching algorithm, by DEKnuth with VRPratt and JHMorris also found, so people call it Knuth- Morris- Pratt operation (referred to KMP algorithm) . KMP algorithm, the key is according to a given pattern string W1, m, define a next function. next function contains localized pattern string matches the information itself.