JavaScript test() Method: RegExp Object


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


Implemented in JavaScript 1.2




RegExp: The name of the regular expression.

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


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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>JavaScript Regexp test Method : Example-1</title>
<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);

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.

Previous: JavaScript exec() Method: RegExp Object
Next: JavaScript toSource() Method: RegExp Object

Test your Programming skills with w3resource's quiz.

JavaScript: Tips of the Day

Converts a string to title case


const toTitleCase = str =>
    .map(x => x.charAt(0).toUpperCase() + x.slice(1))
    .join(' ');
console.log(toTitleCase('some_database_field_name')); // 'Some Database Field Name'
console.log(toTitleCase('Some label that needs to be title-cased')); // 'Some Label That Needs To Be Title Cased'
console.log(toTitleCase('some-package-name')); // 'Some Package Name'
console.log(toTitleCase('some-mixed_string with spaces_underscores-and-hyphens')); // 'Some Mixed String With Spaces Underscores And Hyphens' 


"Some Database Field Name"
"Some Label That Needs To Be Title Cased"
"Some Package Name"
"Some Mixed String With Spaces Underscores And Hyphens"