Validate Email Address
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Problem Statement
Alia is working on a web application that requires users to input their email addresses. To ensure that these email addresses are correctly formatted and likely valid, she needs a function that can accurately determine if an email address is valid according to common standards.
Requirements
Input: A string representing an email address.
Output: A boolean value indicating whether the email address is valid
Email Address Validity Criteria:
The email address must follow the basic structure of
localpart@domain.tld.The
localpart(the part before@) can contain alphanumeric characters and some special characters like.(dot),_(underscore),%(percent),+(plus), and-(hyphen).The
domain(the part after@) can include alphanumeric characters, dots, and hyphens.The
tld(top-level domain) must be at least two characters long and consist of alphabetic characters.
Example 1
Input: password = "example@example.com"
Output: true
Example 2
Input: password = "invalid-email"
Output: false
Example 3
Input: password = "user@domain.co"
Output: true
Example 4
Input: password = "user@domain.c"
Output: false
Solution 1: Email Address Validation using Regular Expressions
function isValidEmail(email) {
// Regex pattern for email validation
const emailRegex = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/;
// Test the email against the regex pattern
return emailRegex.test(email);
}
const password1 = "example@example.com";
isValidEmail(password1); //output: true
const password2 = "invalid-email";
isValidEmail(password2); //output: false
const password3 = "user@domain.co";
isValidEmail(password3); //output: true
const password4 = "user@domain.c";
isValidEmail(password4); //output: false
Local Part: Must start with one or more alphanumeric characters or special characters (
._%+-), followed by an@symbol.Domain Part: Follows the
@with one or more alphanumeric characters or dots and hyphens.Top-Level Domain: Ends with a dot followed by at least two letters (e.g.,
.comor.org).
Resources
A NPM package that helps you test or validate your email address
Frequently asked questions
Why email address validation is important?
Accurate Communication: Validating email addresses ensures that the emails you send reach the intended recipients. This is crucial for account verifications, password resets, and promotional communications.
Reduce Bounces: Proper validation helps in minimizing email bounce rates. Invalid or misspelled email addresses can lead to bounces, which can affect your sender reputation and email deliverability.
User Experience: Providing immediate feedback on invalid email formats enhances the user experience. It helps users correct mistakes before they submit a form.
Prevent Fraud: Validation can help prevent users from entering fake or disposable email addresses, which could be used for fraudulent activities.
Maintain Data Quality: Ensuring that email addresses are valid helps in maintaining the quality of your user database and improves the effectiveness of your marketing campaigns.
Ways to validate Email address?
There are so many ways as follows:
Using Libraries: Libraries like
validator.js(JavaScript),email-validator(Python), or similar tools in other languages provide more robust validation, including syntax checking and sometimes domain verification.Third-Party APIs: Services like Hunter.io, ZeroBounce, or NeverBounce offer APIs to verify the validity of email addresses, including checking whether the email is temporary or associated with spam traps.
Double Opt-In: Send a confirmation email to the user’s provided email address. This not only verifies that the email format is correct but also that the user has access to the inbox. This is often used for account verification or subscription confirmations.
You can implement specific rules based on your application’s needs, such as disallowing certain domains or checking for custom patterns.