How to do case-insensitive matching using JavaScript RegExp?
In this tutorial, we will learn how to use JavaScript RegExp to perform case-insensitive matching.
Regular expressions can be declared in two ways -
- Use regular expression literals, starting and ending with a slash, and The pattern is placed between the two.
- Call the RegExp object constructor, which takes Parameters used to create regular expressions.
Users can use the following syntax to create regular expressions.
grammar
//Using a regular expression literal
const regex = /tutorial/i
//Using RegExp constructor
const regex2 = new RegExp('tutorial', 'i')
In the above syntax, the regular expression is created to match the word "tutorial", the modifier "i" means that it can match any substring with these characters, regardless of their case ("TuToRial", "Tutorial" ,wait).
Use string match() method
The match() method is part of the String object in JavaScript. It is used to match strings with RegExp or regular expressions.
Users can use the match() method with JavaScript RegExp according to the following syntax to perform case-insensitive matching.
grammar
text.match(regex)
In the above syntax, "text" is a string that needs to be checked using a regular expression. "regex" is a regular expression pattern.
parameter
- regex - It is a regular expression or a string that will be converted to a regular expression.
Return type
- Returns an array of all matches, or null if no match is found.
Example
In the example given below, we use the match() method to perform case-insensitive matching. We are checking the match method result when the button is clicked and outputting it.
<html>
<body>
<h4>Performming Case Insensitive Matching with RegExp using <i>
match() </i> method</h4>
<button onclick="check()">Check</button>
<p>Original Text: Welcome to Tutorialspoint</p>
<p>Text To Match: tutorial </p>
<p id="output"></p>
<script>
const text='Welcome to Tutorialspoint'
const regex=/tutorial/i
function check(){
//Using the match method
let result=text.match(regex)
document.getElementById('output').innerHTML='Mached Text: '+result
}
</script>
</body>
</html>
The above output shows that the match() method returns the matching substring "Tutorial".
Use the string search() method
The search() method is part of the String object in JavaScript. It is used to search for a substring of a string based on a RegExp or regular expression.
Users can use the search() method with JavaScript RegExp according to the following syntax to perform case-insensitive matching.
grammar
text.search(regex)
In the above syntax, "text" is a string and "regex" is a regular expression pattern.
parameter
- regex - It is a regular expression or a string that will be converted to a regular expression.
Return type
- Returns the position of the first match, or -1 if no match is found.
Example
In the example given below, we have used the search() method and on click of the button we are checking the result of the search() method and outputting it.
<html>
<body>
<h4>Performming Case Insensitive Matching with RegExp using <i>
search() </i> method.</h4>
<p>Text: Welcome to Tutorialspoint</p>
<p>Text to Match: tutorial</p>
<button onclick="check()">Check</button>
<p id="output"></p>
<p><b>Note:</b>The search() method returns the position of first
match</p>
<script>
const text='Welcome to Tutorialspoint'
const regex=/tutorial/i
function check(){
//Using search method
let result=text.search(regex)
document.getElementById('output').innerHTML='Result: '+result
}
</script>
</body
</html>
In the above output, the user can see that the search() method returns the starting position of the substring "Tutorial".
Use RegExp test() method
The test() method is part of the RegExp object in JavaScript. It is used to test strings based on RegExp or regular expressions.
Users can use the test() method with JavaScript RegExp according to the following syntax to perform case-insensitive matching.
grammar
regex.test(text)
In the above syntax, "text" is a string that needs to be checked using a regular expression. "regex" is a regular expression pattern.
parameter
- Text/String - This is the text or string to be tested.
Return type
- Returns false if no match is found, otherwise returns true.
Example
In the example given below, we have used the test() method.
<html>
<body>
<p>Performming Case Insensitive Matching with JavaScript RegExp using <i>
test() </i> method</p>
<p>Text: Welcome to Tutorialspoint</p>
<p>Text to Match: tutorial</p>
<button onclick="check()">Check</button>
<p id="output"></p>
<p><b>Note:</b> The test() method returns true if there is a match, else
returns false.</p>
<script>
const text = 'Welcome to Tutorialspoint'
const regex = /tutorial/i
function check() {
//Using the test method
let result = regex.test(text)
document.getElementById('output').innerHTML = 'Result: ' + result
}
</script>
</body>
</html>
In the above output, the user can see that the test() method returns true because the "Tutorial" substring is present in the text.
Use RegExp exec() method
The exec() method is part of the RegExp object in JavaScript. It is used to match strings with RegExp or regular expressions.
Users can use the exec() method with JavaScript RegExp according to the following syntax to perform case-insensitive matching.
grammar
regex.exec(text)
In the above syntax, "text" is a string and "regex" is a regular expression pattern.
parameter
- Text/string - The text or string to be matched.
Return type
- Returns an array of all matches, or null if no match is found.
Example
In the example given below, we have used the exec() method.
<html>
<body>
<p>Performming Case Insensitive Matching with JavaScript RegExp using
<i> exec() </i> method</p>
<button onclick="check()">Check</button>
<p>Text: Welcome to Tutorialspoint</p>
<p id="output"></p>
<script>
const text='Welcome to Tutorialspoint'
const regex=/tutorial/i
function check(){
//Using the exec method
let result=regex.exec(text)
document.getElementById('output').innerHTML='Result: '+result
}
</script>
</body>
</html>
The above output shows that the exec() method returns the matching substring "Tutorial".
In this tutorial, we discussed four ways to use RegExp to perform case-insensitive matching. The first two methods are the string match() and search() methods. The other two methods are the RegExp test() and exec() methods.
The above is the detailed content of How to do case-insensitive matching using JavaScript RegExp?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1655
14
1414
52
1307
25
1253
29
1227
24
Is HTML easy to learn for beginners?
Apr 07, 2025 am 12:11 AM
HTML is suitable for beginners because it is simple and easy to learn and can quickly see results. 1) The learning curve of HTML is smooth and easy to get started. 2) Just master the basic tags to start creating web pages. 3) High flexibility and can be used in combination with CSS and JavaScript. 4) Rich learning resources and modern tools support the learning process.
Understanding HTML, CSS, and JavaScript: A Beginner's Guide
Apr 12, 2025 am 12:02 AM
WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.
The Roles of HTML, CSS, and JavaScript: Core Responsibilities
Apr 08, 2025 pm 07:05 PM
HTML defines the web structure, CSS is responsible for style and layout, and JavaScript gives dynamic interaction. The three perform their duties in web development and jointly build a colorful website.
Gitee Pages static website deployment failed: How to troubleshoot and resolve single file 404 errors?
Apr 04, 2025 pm 11:54 PM
GiteePages static website deployment failed: 404 error troubleshooting and resolution when using Gitee...
What is an example of a starting tag in HTML?
Apr 06, 2025 am 12:04 AM
AnexampleofastartingtaginHTMLis,whichbeginsaparagraph.StartingtagsareessentialinHTMLastheyinitiateelements,definetheirtypes,andarecrucialforstructuringwebpagesandconstructingtheDOM.
How to use CSS3 and JavaScript to achieve the effect of scattering and enlarging the surrounding pictures after clicking?
Apr 05, 2025 am 06:15 AM
To achieve the effect of scattering and enlarging the surrounding images after clicking on the image, many web designs need to achieve an interactive effect: click on a certain image to make the surrounding...
HTML, CSS, and JavaScript: Essential Tools for Web Developers
Apr 09, 2025 am 12:12 AM
HTML, CSS and JavaScript are the three pillars of web development. 1. HTML defines the web page structure and uses tags such as, etc. 2. CSS controls the web page style, using selectors and attributes such as color, font-size, etc. 3. JavaScript realizes dynamic effects and interaction, through event monitoring and DOM operations.
How to implement adaptive layout of Y-axis position in web annotation?
Apr 04, 2025 pm 11:30 PM
The Y-axis position adaptive algorithm for web annotation function This article will explore how to implement annotation functions similar to Word documents, especially how to deal with the interval between annotations...
