What does it mean to look around in a regular expression
This article will explain in detail what it means to look around in regular expressions. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.
The details are as follows:
1. Look around is also called pre-search and zero-width assertion.
two。 The look around is divided into
(? = exp) definitely look around in order
(?
