1.javascript-Regular Expression Basics

JavaScript RegExp Objects

One. RegExp Object

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

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

1. Syntax

1 var patt=New RegExp (pattern,modifiers);  // Mode 1 var patt=/pattern/modifiers;            // Mode 2

*pattern (Mode) describes the pattern of an expression

*modifiers (modifier) for specifying global matches, case-sensitive matching, and multi-line matching

2. Modifiers

Modifiers are used to perform case-sensitive and global matching

3. Meta-Characters

Metacharacters is a character with a special meaning.

4. quantifiers

5. Square brackets

Square brackets are used to find characters in a range

Two. RegExp Object methods

1. Basic methods

2. String method that supports regular expressions

　　

1.javascript-Regular Expression Basics