CODEWITHSUNDEEP
javascript
gruppo
gruppo

Reputation: 313

JavaScript regular expression validation for domain name?

How to check a valid domain name and username with regular expression in JavaScript?

function validate()
{
    var patt1=new RegExp(/^[a-zA-Z0-9._-]+\\[a-zA-Z0-9.-]$/);

    var text= document.getElementById('text1').value;

    alert(patt1.test(text));
}

But it does not work for me.

Upvotes: 11

Views: 41781

Answers (5)

KS Rajput
KS Rajput

Reputation: 203

Use this:

<script>
    function frmValidate() {
        var val = document.frmDomin.name.value;
        if (/^[a-zA-Z0-9][a-zA-Z0-9-]{1,61}[a-zA-Z0-9](?:\.[a-zA-Z]{2,})+$/.test(val)) {
            alert("Valid Domain Name");
            return true;
        } else {
            alert("Enter Valid Domain Name");
            val.name.focus();
            return false;
        }
    }
</script>

Upvotes: 5

Mostafa Lavaei
Mostafa Lavaei

Reputation: 2039

This code support sub-domains too:

^(([a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9]|[a-zA-Z0-9])\.)*[a-zA-Z0-9][a-zA-Z0-9-]{1,61}[a-zA-Z0-9]\.[a-zA-Z]{2,}$

Upvotes: -1

gruppo
gruppo

Reputation: 313

function CheckIsValidDomain(domain) { 
    var re = new RegExp(/^((?:(?:(?:\w[\.\-\+]?)*)\w)+)((?:(?:(?:\w[\.\-\+]?){0,62})\w)+)\.(\w{2,6})$/); 
    return domain.match(re);
}

try this its work for me.

Upvotes: 17

L.Grillo
L.Grillo

Reputation: 981

check this: http://shauninman.com/archive/2006/05/08/validating_domain_names

/^([a-z0-9]([-a-z0-9]*[a-z0-9])?\\.)+((a[cdefgilmnoqrstuwxz]|aero|arpa)|(b[abdefghijmnorstvwyz]|biz)|(c[acdfghiklmnorsuvxyz]|cat|com|coop)|d[ejkmoz]|(e[ceghrstu]|edu)|f[ijkmor]|(g[abdefghilmnpqrstuwy]|gov)|h[kmnrtu]|(i[delmnoqrst]|info|int)|(j[emop]|jobs)|k[eghimnprwyz]|l[abcikrstuvy]|(m[acdghklmnopqrstuvwxyz]|mil|mobi|museum)|(n[acefgilopruz]|name|net)|(om|org)|(p[aefghklmnrstwy]|pro)|qa|r[eouw]|s[abcdeghijklmnortvyz]|(t[cdfghjklmnoprtvwz]|travel)|u[agkmsyz]|v[aceginu]|w[fs]|y[etu]|z[amw])$/i

Upvotes: 1

Bergi
Bergi

Reputation: 664185

Don't mix up the RegExp constructor with regex literals. Use either

/^[a-zA-Z0-9._-]+\\[a-zA-Z0-9.-]$/

or 

new RegExp("^[a-zA-Z0-9._-]+\\\\[a-zA-Z0-9.-]$");

Not sure what the backslash does in there, btw. Did you want to match a dot? In literal, use \., in string use \\..

Upvotes: 5

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