Validate URLs with Regex in JavaScript

function isValidURL(url) {
  const urlRegex = /^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/;
  return urlRegex.test(url);
}

// Examples:
// console.log(isValidURL("http://www.example.com"));   // true
// console.log(isValidURL("https://example.com/path")); // true
// console.log(isValidURL("www.sub.domain.org"));       // true
// console.log(isValidURL("invalid-url"));             // false

How it works: This JavaScript function checks if a given string is a valid URL using a regular expression. The regex accounts for optional `http://` or `https://` protocols, a domain name with subdomains, a top-level domain, and optional paths or query parameters. It helps in ensuring that user-provided links adhere to common URL structures, making it useful for form validation and content parsing.