Introduction - If you have any usage issues, please Google them yourself
1 pattern matching: substring positioned in the main string, also called string matching. Pattern matching refers success can be found in the main string S pattern string T, otherwise known as pattern string T does not exist in the main string S.
2 pattern matching in a very wide range. For example, in a text-editing program, we often have to find the location of a particular word appears in the text.
3 study of pattern matching algorithms can greatly improve the response performance of text editing program.