How to validation of email in javascript ?

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To validate an email address in JavaScript, you can use regular expressions (regex) to match the email pattern. Here’s an example function that demonstrates email validation in JavaScript:

function validateEmail(email) {
  const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
  return emailRegex.test(email);
}

In this function, we define a regular expression pattern using the RegExp object. The pattern ^[^\s@]+@[^\s@]+\.[^\s@]+$ matches the following criteria:

^ and $ indicate the start and end of the string, respectively.
[^\s@]+ matches one or more characters that are not whitespace or “@”.
@ matches the “@” symbol.
[^\s@]+ matches one or more characters that are not whitespace or “@”.
\. matches the “.” symbol.
[^\s@]+ matches one or more characters that are not whitespace or “@”.

The test() method of the RegExp object is then used to check if the provided email matches the defined pattern. If the email matches the pattern, test() will return true, indicating that the email is valid. Otherwise, it will return false.

Here’s an example usage of the validateEmail() function:

const email = "example@example.com";
if (validateEmail(email)) {
  console.log("Email is valid.");
} else {
  console.log("Email is not valid.");
}

Replace “example@example.com” with the email address you want to validate. The function will return true if the email is valid and false otherwise.

Note that while this basic regex pattern can validate most common email formats, it may not catch all possible valid email addresses. Email validation can be complex due to various standards and exceptions.

While the regex pattern mentioned earlier provides a basic level of email validation, it’s important to note that it may not catch all possible valid email addresses. Email validation can be a complex task due to the variety of email formats and exceptions allowed by different standards.

If you require more robust email validation, there are libraries available that provide comprehensive email validation functionality. One popular library is called “validator.js.” You can include it in your project by adding the following script tag to your HTML file:

<script src="https://cdn.jsdelivr.net/npm/validator@13.6.0/dist/validator.min.js"></script>

With this library, you can use the validator.isEmail() function to validate an email address. Here’s an example:

const validator = require("validator");

function validateEmail(email) {
  return validator.isEmail(email);
}

const email = "example@example.com";
if (validateEmail(email)) {
  console.log("Email is valid.");
} else {
  console.log("Email is not valid.");
}

In this example, the validator.isEmail() function from the validator.js library is used to validate the email address. It returns true if the email is valid and false otherwise.

Using a library like validator.js can save you from implementing and maintaining complex email validation logic yourself. It covers a wide range of email formats and provides additional validation functions for other purposes as well.

Remember to include the validator.js library in your project by either downloading it locally or using a content delivery network (CDN) link, as shown in the script tag example above.

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