JavaScript RegExp Object & RegExp Methods | JavaScript Regular Expressions - JavaScript Tutorial 88

Notes for You:: JavaScript RegExp Object & RegExp Methods

What is RegExp:
- RegExp is a built-in object, used to define a search pattern (or regular expression), which can be used to make a wide variety of tests on a given string.

Application of Regular Expressions:
- Search for a word(s) in a given string
- Find & replace a word(s) in a given string
- Perform data validations etc. etc.

1. Defining regular expression using RegExp object constructor notation:

Syntax:
var variableName = new RegExp("search pattern", ["flags"] ) ;

Ex: phone number validation
var pattern = new RegExp("^[0-9]{10}$") ;

2. Defining regular expression using RegExp literal notation:

Syntax:
var variableName = /search pattern/ [flags] ;

Ex: phone number validation
var pattern = /^[0-9]{10}$/;

JavaScript RegExp Methods:

test() Method:
- is used to test is there match or no match between regular expression and the given string.
- If there is a match then it returns true otherwise returns false.

Syntax

Ex:
var phoneNumber = "1234567891";
var pattern = /^[0-9]{10}$/;

exec() Method:
- is used to search for an occurrence(s) of a pattern in a given string.
- Returns an array with found pattern, it's index and some other extra properties otherwise returns null.

Note: exec method updates itself for the next match.

Syntax

Example code:
var myName = "I am Javascript. I am the best. I am lovely";
var pattern = /am/g;
var rArray=[];

{
}

Note:
- replace < with less-than symbol.
- replace > with greater-than symbol.

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Follow the link for next video:
JavaScript Tutorial 89 - Regular Expression Flags in JavaScript

Follow the link for previous video:
JavaScript Tutorial 87 - String Methods in JavaScript | JavaScript String Methods

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