Validate domain name PHP

Question

I need to validate domain names using PHP.
Only this format should be allowed: google.com, subdomain.stack-overflow.org etc
It should only allow - (in case of special characters)

No other format should be allowed ex: http, https,?,/index.php,www. etc (none of these should be allowed).

Also i do not want to allow: localhost,mydomain.com

I have tried: FILTER_VALIDATE_URL but it accepts http etc.
I also tried something regular expression like this: [a-z0-9-]+(.[a-z0-9-]+)

But it is allowing ex: stackoverflow (without a .org).

How can I achieve that?

$urlparts = parse_url(filter_var($url, FILTER_SANITIZE_URL));
if(!isset($urlparts['host'])){
    $urlparts['host'] = $urlparts['path'];
}

Why not use FILTER_VALIDATE_URL, then use str_replace to remove the http? — Rich Bradshaw, Aug 20 '13 at 09:59
@RichBradshaw: Because then `http://example.com/page` is also allowed. — Madara's Ghost, Aug 20 '13 at 10:00
@RichBradshaw - `FILTER_VALIDATE_URL` accepts any kind of URL, not only HTTP, and doesn't impose restrictions on the host name (so `localhost` would not be filtered out as the OP wants). — Álvaro González, Aug 20 '13 at 10:03
@ÁlvaroG.Vicario This is a very valid point, i do not want to allow localhost, mydomain.com — sash, Aug 20 '13 at 10:05
@sash I've just linked to the non-accepted answer and it works for your case, see a [demo](http://regex101.com/r/sN2vY7). — HamZa, Aug 20 '13 at 10:23

mynetx · Answer 1 · 2013-08-20T10:30:43.337

1

Your regular expression was nearly correct. Just the . is short for "any character", not just for ".". So, try this regex:

/([0-9a-z-]+\.)?[0-9a-z-]+\.[a-z]{2,7}/

Remember that new top level domains are introduced. They do not use latin characters. Take a look at http://many.at/idntlds/.

About excluding “mydomain.com”: You would have to check for this after applying the regular expression.

edited Aug 20 '13 at 10:30

answered Aug 20 '13 at 10:02

mynetx

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Thank you, i'm trying this. Please check question i have edited it , i want to allow subdomains like subdomain.stack-overflow.org also. Thanks a lot – sash Aug 20 '13 at 10:04
Want to allow sub-subdomains as well, like “user.server.domain.tld”? – mynetx Aug 20 '13 at 10:12
No i want to allow sub domains only. But the domain should not be localhost or mydomain.com – sash Aug 20 '13 at 10:16

Validate domain name PHP

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