Shulou(Shulou.com)06/03 Report--

This article introduces the knowledge of "how to use regular expressions". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

I. Preface

Programming always produces results in practice!

Regular expression, also known as regular expression. (English: Regular Expression, often abbreviated as regex, regexp or RE in code), a concept in computer science. Regular expressions are often used to retrieve and replace text that conforms to a certain pattern (rule).

Regular engines can be divided into two main categories: one is DFA, the other is NFA. Both engines have a long history (more than 20 years now), and many variations have been produced by these two engines! So the introduction of POSIX avoids the continued emergence of unnecessary variants. In this way, the mainstream regular engines are divided into three categories: first, DFA, second, traditional NFA, third, POSIX NFA.

Regularization is also a very interesting technology, but often do not know how to use the programming of these symbols in the actual use, so this article is summarized so that all partners can use it as a tool article. It is convenient to deal with some technical content that requires the use of regularities.

Rule 1. The common symbol x character x\ backslash character\ 0n character n (0) with octal value 0. + (? = Xiao Fu GE

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