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JavaScript Regular Expressions Coding Practice Problems

Last Updated: 01 February 2025

Regular expressions (regex) in JavaScript provide a powerful way to search, match, and manipulate text patterns. They are widely used in form validation, data extraction, ...read more

JavaScript - Username Validation using Regex

Last Updated: 28 March 2026

We are going to validate usernames in JavaScript. Username validation is a common requirement in user registration forms, ensuring that usernames meet the specific criteri...read more

JavaScript

Web Technologies

JavaScript-RegExp

JavaScript - How to Use RegExp in Switch Case Statements?

Last Updated: 23 July 2025

To make your JavaScript switch statements more dynamic and flexible, you can use regular expressions (RegExp). Here are the various ways to use RegExp in switch case state...read more

JavaScript RegExp y Modifier

Last Updated: 04 December 2024

In JavaScript, the y modifier is used in regular expressions for sticky matching, meaning the regular expression search will only start at the position where the last matc...read more

JavaScript

Web Technologies

JavaScript-RegExp

JavaScript RegExp u Modifier

Last Updated: 23 July 2025

The u modifier in JavaScript regular expressions (RegExp) enables Unicode support, ensuring that the pattern correctly interprets and matches Unicode characters, including...read more

JavaScript

Web Technologies

JavaScript-RegExp

JavaScript RegExp s Modifier

Last Updated: 23 July 2025

The s modifier (also known as the "dotall" modifier) in JavaScript regular expressions allows the dot (.) metacharacter to match newline characters (\n) as well. Without t...read more

JavaScript

Web Technologies

JavaScript-RegExp

JavaScript String.Split() Example with RegEx

Last Updated: 05 August 2025

The String.split() method in JavaScript is used to divide a string into an array of substrings. While it is often used with simple delimiters like spaces or commas, you ca...read more

JavaScript - What is RegExp Object?

Last Updated: 05 December 2024

The RegExp object in JavaScript is a powerful tool for pattern matching, searching, and manipulating strings. It allows you to define patterns for matching text and helps ...read more

JavaScript - Validate Password in JS

Last Updated: 20 April 2026

Password validation in JavaScript using regular expressions ensures that user passwords meet specific security requirements. It helps distinguish between strong and weak p...read more

JavaScript - How to Access Matched Groups in Regular Expression?

Last Updated: 23 July 2025

Here are the different methods to access matched groups in JavaScript regular Expression(RegExp).1. Using exec() MethodThe exec() method returns an array with the entire m...read more

JavaScript - How to Use a Variable in Regular Expression?

Last Updated: 05 August 2025

To dynamically create a regular expression (RegExp) in JavaScript using variables, you can use the RegExp constructor. Here are the various ways to use a variable in Regul...read more

JavaScript - How to Add Spaces Between Words Starting with Capital Letters Using RegExp?

Last Updated: 07 December 2024

Here are the different ways to add spaces between words starting with capital letters using RegExp in JavaScript1. Use Regex with the replace MethodThis is the most direct...read more

JavaScript RegExp Flags Property

Last Updated: 05 August 2025

RegExp flags are a set of optional characters added to the regular expression pattern to control its behavior. Flags modify how the pattern is interpreted during the searc...read more

JavaScript

Web Technologies

JavaScript-RegExp

JavaScript RegExp dotAll Property

Last Updated: 05 August 2025

The dotAll property in JavaScript regular expressions determines whether the 's' (dotAll) flag is enabled. This flag modifies the behaviour of the dot (.) metacharacter, a...read more

JavaScript

Web Technologies

JavaScript-RegExp

JavaScript RegExp() Constructor

Last Updated: 23 July 2025

The RegExp() constructor in JavaScript allows you to create a regular expression object that can be used to match patterns in strings. This method is particularly useful w...read more

JavaScript

Web Technologies

JavaScript-RegExp

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