Use regex.test() if all you want is a boolean result:
console.log(/^([a-z0-9]{5,})$/.test('abc1')); // false
console.log(/^([a-z0-9]{5,})$/.test('abc12')); // true
console.log(/^([a-z0-9]{5,})$/.test('abc123')); // true...and you could remove the () from your regexp since you've no need for a capture.
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › RegExp › test
RegExp.prototype.test() - JavaScript | MDN
This example tests if "hello" is contained at the very beginning of a string, returning a boolean result. ... function testInput(re, str) { const midString = re.test(str) ? "contains" : "does not contain"; console.log(`${str} ${midString} ${re.source}`); } When a regex has the global flag set, ...
W3Schools
w3schools.com › jsref › jsref_regexp_test.asp
JavaScript RegExp test() Method
cssText getPropertyPriority() ... RegExp Methods Next ❯ · Search a string for the character "e": let text = "The best things in life are free"; let pattern = /e/; let result = pattern.test(text); Try it Yourself ...
Videos
01:00
How to use regex to check if a javascript string contains a pattern ...
02:51
JavaScript Regular Expressions: Using the Test Method | FreeCodeCamp ...
03:40
JavaScript Regex: Mastering the test() Method for Beginners - YouTube
17:55
RegExp - regex // JavaScript Regular Expressions Ultimate MasterClass ...
12:22
Regular Expressions (RegEx) Tutorial #13 - Testing a RegEx Pattern ...
06:28
JavaScript Regex for Absolute Beginners | Beginner Guide - YouTube
Top answer 1 of 15
1847
Use regex.test() if all you want is a boolean result:
console.log(/^([a-z0-9]{5,})$/.test('abc1')); // false
console.log(/^([a-z0-9]{5,})$/.test('abc12')); // true
console.log(/^([a-z0-9]{5,})$/.test('abc123')); // true...and you could remove the () from your regexp since you've no need for a capture.
2 of 15
271
Use test() method :
var term = "sample1";
var re = new RegExp("^([a-z0-9]{5,})$");
if (re.test(term)) {
console.log("Valid");
} else {
console.log("Invalid");
}
Regex101
regex101.com
regex101: build, test, and debug regex
Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/.NET, Rust.
Mozilla
developer.mozilla.org › en-US › docs › Web › JavaScript › Guide › Regular_expressions
Regular expressions - JavaScript | MDN
js · /\p{L}*/u; Unicode regular expressions have different execution behavior as well. RegExp.prototype.unicode contains more explanation about this. Note: Several examples are also available in: The reference pages for exec(), test(), match(), matchAll(), search(), replace(), split() The guide articles: character classes, assertions, groups and backreferences, quantifiers ·
RegExr
regexr.com
RegExr: Learn, Build, & Test RegEx
Regular expression tester with syntax highlighting, PHP / PCRE & JS Support, contextual help, cheat sheet, reference, and searchable community patterns.
Regular-Expressions.info
regular-expressions.info › javascriptexample.html
JavaScript RegExp Example: Online Regular Expression Tester
<SCRIPT LANGUAGE="JavaScript"><!-- function demoMatchClick() { var re = new RegExp(document.demoMatch.regex.value); if (document.demoMatch.subject.value.match(re)) { alert("Successful match"); } else { alert("No match"); } } function demoShowMatchClick() { var re = new RegExp(document.demo...
GeeksforGeeks
geeksforgeeks.org › javascript › javascript-regexp-test-method
JavaScript RegExp test() Method - GeeksforGeeks
July 11, 2025 - let str = "GeeksforGeeks : A computer science portal for geeks."; let regex = new RegExp("computer",); let rex = regex.test(str); console.log(rex); ... Example 2: Searching for the string "GEEK" in the original string.
Regex Pal
regexpal.com
Regex Tester - Javascript, PCRE, PHP
Test your Javascript and PCRE regular expressions online.
Softchris
softchris.github.io › pages › javascript-regex.html
Regex in JS - how YOU can learn it and learn to like it
The above RegEx fulfills all our ... a number at the end. Let's start to see if the incoming route matches: /\/products\/\d+$/.test('/products/112') // true /\/products\/\d+$/.test('/products/') // false...
TutorialsPoint
tutorialspoint.com › home › javascript › javascript regexp test
JavaScript RegExp Test
September 1, 2008 - In the following program, we are using the JavaScript RegExp.test() method to test whether the string matches a specified pattern ("\Hello*") defined by the regular expression within this string "Hello World".
W3Resource
w3resource.com › javascript › object-property-method › regexp-test.php
JavaScript test() Method : RegExp Object - w3resource
<
Built In
builtin.com › software-engineering-perspectives › javascript-regex
A Guide to JavaScript Regular Expressions (RegEx) | Built In
An example of regex in JavaScript could be checking if a match for the character pattern "apple" exists within the string "apple tree". To test this, you could use the RegExp.prototype.test() method below:
SitePoint
sitepoint.com › blog › javascript › quick tip: testing if a string matches a regex in javascript
Quick Tip: Testing if a String Matches a Regex in JavaScript — SitePoint
November 6, 2024 - For example, if you want to find all the digits in a string, you can use the \d special character to represent digits in a regular expression: let str = "The year is 2022."; let result = str.match(/\d+/g); console.log(result); // ["2022"] In ...
Qodex
qodex.ai › home › all tools › getting started › javascript regex tester
JavaScript Regex Tester — Test Patterns Live Online
Test and debug JavaScript regex patterns in real time. See matches highlighted, capture groups extracted, and flags applied instantly. Free, no signup needed.
Regex Tester
regextester.com
Regex Tester and Debugger Online - Javascript, PCRE, PHP
Regular Expression Tester with highlighting for Javascript and PCRE. Quickly test and debug your regex.
Educative
educative.io › answers › what-is-the-regextest-method-in-javascript
What is the regex.test() method in JavaScript?
The regex.test() method is used to test for a match in a string. The method returns true if it finds a match; otherwise, it returns false. ... The RegExpObject class deals with regular expressions. Both String and RegExp define methods that use regular expressions to perform powerful pattern-matching and search-and-replace functions on text. ... In the example ...
W3Schools Blog
w3schools.blog › home › javascript regex test() method
JavaScript RegEx test() method - W3schools
May 29, 2019 - <!DOCTYPE html> <html> <body> <script> var string = "HELLO WORLD"; var a = new RegExp( "HELLO", "g" ); var print = a.test(string); document.write("Returned value : " + print); </script> </body> </html>
Carmatec
carmatec.com › home › guide to mastering javascript regex match with examples
Guide to Mastering JavaScript Regex Match with Examples
December 31, 2025 - Example: <.*?> matches <tag> instead of the entire string. ... Instead of writing a single, massive regex, break tasks into smaller steps or use multiple regexes. ... Always escape special characters when matching them literally (e.g., \. for a dot).
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › String › match
String.prototype.match() - JavaScript | MDN
The following example demonstrates the use of the global flag and ignore-case flag with match(). All letters A through E and a through e are returned, each its own element in the array. ... const str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; const regexp = /[a-e]/gi; const matches = str.match(regexp); console.log(matches); // ['A', 'B', 'C', 'D', 'E', 'a', 'b', 'c', 'd', 'e']