正则表达式，又称常规表达式、正规表达式（Regular Express

Regular expression, also known as regular expression, regular expression (Regular Expression). Regular expressions are strings that can be used to match a series of strings that meet certain grammatical rules. You can check whether a string contains a certain kind of substring by matching the string, or replace the matching substring or extract a substring that meets certain conditions from a certain string. A regular expression is a string composed of ordinary characters (such as letters a to z, etc.) and special characters (called "metacharacters", such as: * * etc.), which can represent a certain type of string (such as : A string of all letters, a string of all numbers, etc.). A regular expression is like a template. The searched string is matched with the template. The part that matches the template succeeds, and the part that does not match the template fails. At present, many computer programming languages ​​support the use of regular expressions to match string operations, and Python is also one of them.

A regular expression, also known as a regular expression, a regular expression. A regular expression is a string that can be used to match a series of strings that conform to a specific syntax rule. You can check whether a string contains some kind of substring by matching strings, or replace a matching substring, or remove a string from a string that meets a certain criterion, and so on. Regular expressions are common characters (such as the letters a to z, etc.) and special characters (called metacharacters, for example: . * ? a string that can represent a class of strings (for example, a string of all letters, a string of all numbers, and so on). The regular expression acts like a template that matches the string you are searching with the template, matching part of the template's success and partially matching the template. Python is one of many computer programming languages that currently support the use of regular expressions to match string operations.

Regular expression, also known as regular expression. A regular expression is a string that can be used to match a series of strings that conform to specific syntax rules. You can check whether a string contains a seed string by matching a string, replace the matched substring, or take out the substring that meets a certain condition from a string. A regular expression is a string composed of ordinary characters (such as letters a to Z, etc.) and special characters (called "metacharacters", such as:. *? Etc.), which can represent a certain type of string (such as string composed of all letters, string composed of all numbers, etc.). Regular expression is like a template. It matches the searched string with the template. Partial matching that matches the template succeeds, while partial matching that does not match the template fails. At present, many computer programming languages support using regular expressions to match string operations, and Python is one of them.<br>