JavaScript RegExp Reference

RegExp stands for Regular Expression. A regular expression is a sequence of characters that forms a search pattern. The search pattern can be used for text search and text to replace operations. A regular expression can be a single character or a more complicated pattern.

Syntax:

new RegExp("(Regular Expressioncharactersnonword)")

Example: This example searches the words whose starting character is “A” and ending character is “C” with only one character in between them.

let str = "ABC, A3C, A C, AXXCC!";
let regex = /A.C/g;
console.log(str.match(regex));

[ 'ABC', 'A3C', 'A C' ]

The complete list of JavaScript RegExp is listed below:

JavaScript RegExp Constructor:

In JavaScript, a constructor gets called when an object is created using the new keyword.

RegExp(): It creates a new RegExp object.

const str = "geeksforgeeks"
const reg = new RegExp(/[g]/, 'g');
console.log(str.match(reg));

[ 'g', 'g' ]

JavaScript RegExp Properties: A JavaScript property is a member of an object that associates a key with a value.

• Instance Property: An instance property is a property that has a new copy for every new instance of the class.

JavaScript RegExp Methods: JavaScript methods are the actions that can be performed on objects.

Instance Method:

If the method is called on an instance of a RegExp then it is called an instance method.

The Different Metacharacters and Flags of RegExp is given below: