How to check entered mail is valid or not

To check if an entered email is valid or not, you can use a combination of regular expressions and email validation libraries. Here are a few ways to do it:

Method 1: Using Regular Expressions

You can use a regular expression to match the email format. Here's an example:

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

if (emailRegex.test(email)) {
  console.log("Email is valid");
} else {
  console.log("Email is not valid");
}

This regular expression matches most common email formats, but it's not foolproof. It may not match all valid email addresses or reject some invalid ones.

Method 2: Using an Email Validation Library

You can use a library like email-validator (for JavaScript) or email-validator (for Python) to validate email addresses. These libraries provide more advanced email validation capabilities.

Here's an example using email-validator for JavaScript:

const EmailValidator = require('email-validator');

const email = "[email protected]";
const isValid = EmailValidator.validate(email);

if (isValid) {
  console.log("Email is valid");
} else {
  console.log("Email is not valid");
}

Method 3: Using a Server-Side Validation

If you're building a web application, you can use a server-side language like PHP, Python, or Ruby to validate email addresses. For example, in PHP:

<?php
$email = "[email protected]";
if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
  echo "Email is valid";
} else {
  echo "Email is not valid";
}
?>

Common Email Validation Rules

Here are some common email validation rules you can use:

Local part: The part before the @ symbol should contain only letters, numbers, dots, hyphens, and underscores.
Domain: The part after the @ symbol should contain only letters, numbers, dots, and hyphens.
Top-level domain: The part after the last dot should be a valid top-level domain (e.g., .com, .org, .net).
Length: The email address should not be too long or too short.

Remember that email validation is not foolproof, and there may be valid email addresses that don't match these rules. Always use a combination of methods to ensure the best possible validation.

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How to check entered mail is valid or not