invalid regular expression nothing to repeat

Objective Regular expressions are cumbersome, but powerful, learned applications will give you an absolute sense of accomplishment in addition to improving efficiency. It is not a problem to master regular expressions, as long as you read them

For example, what is the difference between the {code...} symbols in [] and those outside? For example: [\ W.] + and [\ w. + *?] What is the difference between these symbols and the outside in? Reply content: For example: [\ W.] + and [\ w. +

For example: [\w.]+和[\w.+*?] What is the difference between these symbols in [] and the outside? Reply content: For example: [\w.]+和[\w.+*?] What is the difference between these symbols in [] and the outside? First [] , the contents of the

  For example: In the current directory, find the file with the suffix. C containing the hello string: Find.-Name "*. c" | xargs grep-h "hello" Appendix: (transfer) 1. grep Introduction Grep (Global Search Regular Expression (re) and print out the

Every time you use string mode matching, you always have to go through the instructions on the Lua official website. There is no detailed description on the Internet, and many friends have asked me about the content, in fact, there are three

Why do I have to introduce the garbage station in the new column? Because of the outdated area are MJJ veteran, you post he may not see, you hard to knock half a day of keyboard he may be my proud drift. R: Or to provide some things for new people,--

The special symbols commonly used in the shell are listed below:# ; ;; .   ,/\ \ ' String ' |! $   ${}   $? $$   $*\ "string\" * * *? : ^ $# [email protected] ' command ' {} [] [[]] () (())|| && {Xx,yy,zz,...} ~ ~+ ~-& \\ +-%= = = =# pound (comments)

1. Routing RulesRap Frame page routing based on Ui-router implementation1.1 Ui-routerA basic routing status is as follows: Routing configuration:$stateProvider. State (' po ', {URL: '/po ',Abstract:false,Templateurl:

Original article address: Two good Vim skillsAuthor: Liurhyme Note the following before reading this article:1. The goal of this article is to provide some Vim usage skills, which can improve the efficiency of VIM operations. Some tips can also be

Note the following before reading this article:1. The goal of this article is to provide some Vim usage skills, which can improve the efficiency of VIM operations. Some tips can also be used on VI, but now Vim is basically used.2. this article