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Asked: 2024-09-24T21:30:55+05:30 In:

Design a function that verifies if a given string is a valid email address according to specific criteria. The email address must conform to the following guidelines: 1. It should consist of a local part and a domain part, separated by an ‘@’ symbol. 2. The local part can include letters, digits, and special characters such as ‘.’, ‘_’, and ‘+’, but it must not start or end with these special characters. 3. The domain part should contain letters and can include periods, but it must not start or end with a period. 4. The domain must also contain at least one period and have a valid top-level domain that has a minimum length of two characters. 5. Both the local part and the domain part should not exceed 64 and 253 characters, respectively. Implement the function and return a boolean indicating whether the input string meets all these conditions.

Have you ever tried to figure out whether an email address is valid or not? It can get pretty tricky, right? I’ve been working on a little project that requires verifying email addresses based on a set of guidelines. It feels satisfying when it works correctly! I’m curious if you’d be up for a challenge to design a function that checks if a given string is a valid email according to some specific rules I came up with.

Here’s what you need to keep in mind:

First, the email has to be separated into two parts – the local part and the domain part – with an ‘@’ symbol in between. Sounds easy enough! But wait, let’s dig deeper into the local part. This part can include letters, numbers, and some special characters like ‘.’, ‘_’, and ‘+’. However, there’s a catch: the local part can’t start or end with those special characters.

Now let’s talk about the domain part. This one’s crucial! It should consist of letters and can have periods in it. But hold on! Just like the local part, the domain can’t start or end with a period. Plus, there needs to be at least one period in there, and the top-level domain (the stuff after the last period) has to be at least two characters long.

And here’s where it gets a bit more complicated: there are length restrictions too! The local part should not exceed 64 characters, and the domain part must be 253 characters at most.

So, all in all, this simple task of validating email addresses becomes a web of criteria! Think you can piece together a function that checks these conditions? Give it a shot! Make sure it returns a boolean – either true or false – to indicate whether the email matches all those conditions. I’d love to see how you approach this cool coding challenge; it could be a real brain teaser! What do you think?

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    2 Answers


    1. Wow, this sounds like a fun challenge! I’ve never really thought about all the rules that go into email validation before. It seems like just checking for the presence of an ‘@’ symbol isn’t enough, huh? I mean, the local part has to be all fancy with letters, numbers, and a few special characters, but no starting or ending with those special characters? That’s pretty specific!

      And the domain part needing at least one period and some length rules makes it even trickier. Who knew email addresses had so many hidden rules! Also, those character limits? Yikes!

      But I think I could give it a shot! Here’s a basic idea of how I might approach this using a function:

      
function isValidEmail(email) {
    const localPart = email.split('@')[0];
    const domainPart = email.split('@')[1];
    
    // Check if there's exactly one '@'
    if (email.indexOf('@') === -1 || email.indexOf('@') !== email.lastIndexOf('@')) {
        return false;
    }
    
    // Check local part rules
    if (localPart.length > 64 || /^[._+]/.test(localPart) || /[._+]$/.test(localPart)) {
        return false;
    }
    if (!/^[a-zA-Z0-9._+]*$/.test(localPart)) {
        return false;
    }
    
    // Check domain part rules
    if (!domainPart || domainPart.length > 253 || !domainPart.includes('.')) {
        return false;
    }
    if (/^[.]|[.]$/.test(domainPart)) {
        return false;
    }
    
    const tld = domainPart.split('.').pop();
    if (tld.length < 2) {
        return false;
    }
    
    return true;
}

      So, this function splits the email into local and domain parts and checks all the rules you mentioned. I hope this makes sense! I'm excited to try and see if it works. Thanks for the cool challenge!


    2. Validating an email address can indeed be quite complex, given the numerous rules governing its structure. The primary challenge lies in correctly separating the email into its local and domain parts, ensuring that each adheres to the specified criteria. The local part permits letters, numbers, and certain special characters, but it is crucial that it doesn’t begin or end with these special characters. Similarly, the domain part must include only letters and periods, while also avoiding starting or ending with a period. Furthermore, additional restrictions such as mandatory presence of a period in the domain and a minimum length requirement for the top-level domain make the validation process intricate.

      To tackle this challenge, the following function can be designed, employing regular expressions to succinctly encapsulate the validation rules. The function checks that the email split correctly on the ‘@’, validates both parts against their respective conditions, and ensures the overall length restrictions are honored. The function ultimately returns a boolean value, indicating whether the email address is valid or not. This approach not only streamlines the validation process but also enhances readability and maintainability of the code.

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