A detailed description of the regular expression of JavaScript learning

what is a regular expression (Regular expreSSion)

A regular expression is an object that describes the character pattern.

Can handle more complex strings

　　Regular Expressions in JavaScript use the RegExp Object Representation

Regular expressions are used to match string patterns and retrieve replacements, and are powerful tools for performing pattern matching on strings.

　　How to use Regular Expressions in JavaScript

　　Grammar

　　var patt=new RegExp (pattern,modifiers)

Dynamic creation of regular expressions

　　var patt=/pattern/modifiers;

　　Parameters

　　Pattern ( pattern ) describes the mode of an expression

　　ModifierS ( modifier ) for specifying global matching, case-sensitive matching, and multiline matching

　　Common modifiers

Modifiers are used to perform case-sensitive and global matching

　　Square brackets

Square brackets are used to find characters in a range

　　Metacharacters

metacharacters ( Metacharacter) is a character that has a special meaning

　　Quantifiers

original link:http://www.maiziedu.com/wiki/js/regexp1/

A detailed description of the regular expression of JavaScript learning