Regex javascript email validation

Here is a common regex pattern for email validation in JavaScript:

const emailRegex = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/;

Let's break it down:

• ^ matches the start of the string
• [a-zA-Z0-9._%+-]+ matches one or more of the following characters: letters (both uppercase and lowercase), numbers, dot (.), hyphen (-), underscore (_), percent (%), plus sign (+)
• @ matches the @ symbol
• [a-zA-Z0-9.-]+ matches one or more of the following characters: letters (both uppercase and lowercase), numbers, dot (.), hyphen (-)
• \. matches a period (.) character
• [a-zA-Z]{2,} matches the domain extension (it must be at least 2 characters long)
• $ matches the end of the string

You can use this regex pattern in JavaScript like this:

function validateEmail(email) {
  const regex = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/;
  return regex.test(email);
}

const email = "[email protected]";
if (validateEmail(email)) {
  console.log("Email is valid");
} else {
  console.log("Email is not valid");
}

Note that this regex pattern is not foolproof and may not catch all invalid email addresses. For example, it does not check for the existence of a local part (before the @ symbol) or the domain name. Additionally, it does not check for common typos or formatting errors.

If you need more advanced email validation, you may want to consider using a library or service that specializes in email validation, such as EmailValidator.js or EmailVerify.

Also, it's worth noting that the best way to validate an email address is to use a service that actually checks the email address, such as sending a verification email to the address.