regex-validate-email-addresses.md

Validate Email Address

📝 Problem

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

1. Input: A string representing an email address.

2. 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.

📌 Examples

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

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✅ Solutions

💡 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);
}