What will be preg_match for domain names?

Hi,
I need a preg_match pattern that matches all these domain names, but I cannot seem to get it right. Can someone help please? Thanks

something.firm.in
something123.firm.in
some-thing-123.firm.in
something.net.in
something.co.in
something.co
some-thing.com
something.info
some-thing.name
so.com

I need this for a function so if someone posts a domain name, then my php script can validate if it is actually a domain name. True/False etc.
I think I have all possible combinations in that list, but if I missed something, please let me know.
Thanks

 

function parseDomain($domain)
{
    preg_match("/^[a-zA-Z0-9-.]+(.com|.in|.co|.info|.name)$/", $domain, $matches);
    if ($matches) { return true; } else { return false; }
}

$domainList = array("joke_domain.com", "musli#.com", "something.firm.in", "something123.firm.in", "some-thing-123.firm.in", "something.net.in", "something.co.in", "something.co", "some-thing.com", "something.info", "some-thing.name", "so.com");

foreach ($domainList as $domain)
{
    if (parseDomain($domain) == true) {
    
        echo "$domain - VALID <br>";
    
    } else {
    
        echo "$domain - NOT a valid domain name <br>";
    
    }
}

PHP:

[COLOR="red"]joke_domain.com - NOT a valid domain name
musli#.com - NOT a valid domain name[/COLOR]
[COLOR="green"]something.firm.in - VALID
something123.firm.in - VALID
some-thing-123.firm.in - VALID
something.net.in - VALID
something.co.in - VALID
something.co - VALID
some-thing.com - VALID
something.info - VALID
some-thing.name - VALID
so.com - VALID[/COLOR]

Code (markup):

 

^^ how about xx...com , testasfasdfcom?

 

Hi,
Thanks for code above, but is it possible to modify it so I don't have to hard code domain extensions? Those are the main problem for me.

preg_match("/^[a-zA-Z0-9-.]+(.com|.in|.co|.info|.name)$/", $domain, $matches);

I think extensions follow these rules:
1> It's only between a-zA-Z
2> could "only" be between 2-4 chars long
3> could have a second part seperated by a . sign
4> The second part can be 2-4 chars long and is between a-zA-Z

How would I modify the second part of the preg pattern above so it matches these 4 rules?
Thanks

 

Hi,
I think this works:

$c='domain.com';
preg_match('/^([a-zA-Z0-9-]{2,})+(\.[a-zA-Z]{2,4})*(\.[a-zA-Z]{2,4})$/is', $c, $match);

Thanks

 

preg_match("/^[a-zA-Z0-9]*((-|\.)?[a-zA-Z0-9])*\.([a-zA-Z]{2,4})$/", $domain, $matches); 

PHP:

Matches everything that should be matched