Javascript email validation regex inclusion

Question

I got the javascript email validation code from this post. According to the all the answers the RFC2822 regex is as per following:

[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?

I tried to include this in js, but it gives a syntax error.

var email = this.value;
if(email.match(/[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/) )
{
    //matched...
} else {
    //not matched..
}

I am using eclipse, and it's giving the error as soon as I enter this code. Here are some of the errors from the long list

Multiple markers at this line
- Syntax error on tokens, ArrayLiteralHeader expected instead
- Syntax error on token "?", invalid Expression
- Syntax error on token "Invalid Character", delete this token
- Syntax error on tokens, delete these tokens
- Syntax error, insert ")" to complete Arguments
- Missing semicolon
- Syntax error on token "Invalid Character", delete this token
- Syntax error, insert ")" to complete PrimaryNoNewArray
- Syntax error on tokens, ArrayLiteralHeader expected instead
- Syntax error on token "^", invalid (

Please let me know how to properly include email validation regex into the code?

EDIT

Tried in browser console. Exact same syntax works in chrome js console. Here is the output

Web console

Thanks

Apparently / don't close the literal when it is inside a character class, but Eclipse might not understand this. Escape all / inside the expression. — Felix Kling
– Felix Kling, Commented Sep 2, 2012 at 12:39

xdazz · Accepted Answer · 2012-09-02 12:11:29Z

3

Javascript regex literal need / to enclose it.

if(email.match(/[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/) )
{
    //matched...
} else {
    //not matched..
}

answered Sep 2, 2012 at 12:11

xdazz

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4 Comments

mtk Over a year ago

Please, check the same thing in eclipse if you can. I can't get what's wrong? Same error as posted in the questions.

xdazz Over a year ago

@mtk Just try it in the browser console.

Felix Kling Over a year ago

@xdazz: yeah, I just noticed that, sorry. But this could still be the reason for the error in Eclipse.

xdazz Over a year ago

@FelixKling yes, that may be the reason ~

UltraInstinct · Accepted Answer · 2012-09-02 12:11:24Z

1

In Javascript, you use regexes like the below:

myString.match(/<regexHere>/)

answered Sep 2, 2012 at 12:11

UltraInstinct

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1 Comment

UltraInstinct Over a year ago

I have no experience with eclipse. I am guessing it has some bug with (basic) Javascript grammar. Could you try executing it directly?

TheHe · Accepted Answer · 2012-09-02 12:11:33Z

0

the regex must be encapsulated by "/" in javascript:

    if (/[a-z0-9!#$%&'*+\/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+\/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/i.test(subject)) {
        // Successful match
    } else {
        // Match attempt failed
    }

answered Sep 2, 2012 at 12:11

TheHe

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3 Comments

mtk Over a year ago

Please, check the same thing in eclipse if you can. I can't get what's wrong? Same error as posted in the questions.

TheHe Over a year ago

eclipse? are you sure that you're doing JavaSCRIPT?

mtk Over a year ago

yes, I am doing a php project with some css, js, and obviously html.

Konstantin XFlash Stratigenas · Accepted Answer · 2025-01-01 05:51:59Z

You can clean you E-Mail-Address like this:

// Function to get a cleaned email address
function getEmailCleaned(email) {
    // Regex for allowed characters in an email address
    const regex = /[a-z0-9!#$%&'*+/=?^_`{|}~.@-]/gi;

    // Filter only the allowed characters from the input
    const cleanedEmail = email.match(regex)?.join('') || '';

    // Verify that the cleaned email address is valid
    const emailRegex = /^[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$/i;
    if (emailRegex.test(cleanedEmail)) {
        return cleanedEmail.trim(); // Removes unnecessary spaces
    } else {
        return null; // The cleaned email address is invalid
    }
}

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