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        Many people's first reaction when they see regular expressions is that they have a big head and are difficult to learn. They have such a long string of symbols. What is this. Ah! Don't worry. In fact, regular expressions are easy to understand step by step. Don't believe it? Look! catalogue 1, What is a regular e ...

Why use regular expressions? Regular matching can realize fuzzy matching. In actual development, it is often necessary to match a certain range of data, such as verifying whether the mailbox entered by the user is correct; In addition to @ and other fixed characters, we can't measure and count the other characters we input. At this time, ther ...

Validation -- a feature rich PHP parameter validator Validation is used to check the validity of background parameters. Easy to use and intuitive. https://github.com/gitHusband/Validation If you have any opinions or ideas, we can communicate and discuss together! As for why I wrote this tool: For background parameters, in theory, t ...

1, Text processing tool grep Linux has the tools grep, sed and awk called the three swordsmen of text processing. In this paper, grep 1. Brief introduction grep text filtering tool, fully known as Global search REgrlat expression and Print out the line. You can match the content between large sections of text according to the specified filte ...

preface Now Nginx has become the first choice for many companies as front-end proxy pass servers. In practical work, they often encounter a lot of requirements for jump (Rewriting URL). For example, after changing the domain name, you need to keep the old domain name jump to the new domain name, change a web page and jump to a new page, we ...

A recent Python experiment found that regular expressions and their standard library in py have a lot of points to think about. So I decided to write a short note and I'd like to review it later. noun Because regular expressions are described differently in different literature, here is a list of noun representations that I know: In this no ...

re.match() find one from scratch re.search() found one** re.findall() find all **Returns a list. If there is no, it is an empty list re.findall('\d','chuan1zhi2')   The result is['1','2'] re.sub() replace re.sub('\d','_','chuan1zhi2')   The result is['chuan_zhi_'] Re.compile** Returns a model p with the same method as re, but with dif ...

introduction Regular expressions are special strings used to match text (character set). If you want to extract a phone number from a text file, you can use a regular expression. If you need to find all files with numbers in the middle of the name, you can use a regular expression. If you want to find all duplicate words in a text block, ...

catalogue 1, Regular expression 1. Introduction 2. Common matching types 3. Query mode 2, Operator 1. Arithmetic operator 2. Comparison operator 3. Logical operator (Boolean)   4. Bitwise operator   3, Connection query 1. Inner connection 2. Left connection 3. Right connection summary 1, Regular expression 1. Introduc ...

catalogue 1, Common pipeline commands 1.1 sort command 1.2 uniq command 1.3 tr command 1.4cut command 1.5 examples 1.5.1 statistics of current host connection status 1.5.2 count the number of currently connected hosts 2, Regular expression 2.1 definition of regular expression 2.2 common metacharacters (supported tools: find, grep, eg ...