w3resource

JavaScript test() Method: RegExp Object

Description

The test() method of the RegExp executes a search for a match between a regular expression and a specified string. Returns true or false.

Version

Implemented in JavaScript 1.2

Syntax

Regexp.test(str)

Parameter

RegExp: The name of the regular expression.

str: The string against which to match the regular expression.

Example:

The following web document demonstrates how the test() method can be used.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>JavaScript Regexp test Method : Example-1</title>
</head>
<body>
<h1 style="color: red">JavaScript Regexp test Method</h1>
<hr />
<script type="text/javascript">
//This is done to make the following JavaScript code compatible to XHTML. <![CDATA[
// Create a new RegExp object.
newRe = new RegExp('Fox','g')
// Define a string.
str1 = 'The Quick Brown Fox Jumps Over The Lazy Dog';
// Check whether regular expression exists in the string.
if (newRe.test(str1))
{
document.write("'Fox' is found in "+str1);
}
//]]>
</script>
</body>
</html>

View the example in the browser

Supported Browser

Internet Explorer 7 Firefox 3.6 Google Chrome 7 Safari 5.0.1 Opera 10
Yes Yes Yes Yes Yes

See also:

JavaScript Core objects, methods, properties.

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JavaScript: Tips of the Day

arrow function

const user = {
	email: "[email protected]",
	updateEmail: email => {
		this.email = email
	}
}

user.updateEmail("[email protected]")
console.log(user.email)

The updateEmail function is an arrow function, and is not bound to the user object. This means that the this keyword is not referring to the user object, but refers to the global scope in this case. The value of email within the user object does not get updated. When logging the value of user.email, the original value of [email protected] gets returned.

Ref: https://bit.ly/2IUFeTa