How to remove name and keep just tld in a domain name string PHP & Regex

Question

[PHP] I want to strip off domain keyword and leave just TLD. How do i achieve it? I tried some string functions with help of Regex Patterns but they only support 1 domain. But you can see i have multiple entries.

Original String:

{
   "example.biz":"Available",
   "example.co":"Available",
   "example.com":"Unavailable",
   "example.mobi":"Available",
   "example.net":"Unavailable",
   "example.org":"Unavailable"
}

Intended Output.

{
   "biz":"Available",
   "co":"Available",
   "com":"Unavailable",
   "mobi":"Available",
   "net":"Unavailable",
   "org":"Unavailable"
}

Amal · Accepted Answer · 2014-03-29 12:27:38Z

1

You don't need a regex to achieve this. Your string looks like valid JSON. You can parse it to an array using json_decode() (with second parameter set as TRUE to get an associative array) and then remove everything before the . using strstr() and ltrim():

$string = <<<'EOD'
{
   "example.biz":"Available",
   "example.co":"Available",
   "example.com":"Unavailable",
   "example.mobi":"Available",
   "example.net":"Unavailable",
   "example.org":"Unavailable"
}
EOD;

$jsonArr = json_decode($string, TRUE);
$result = array();

foreach ($jsonArr as $domain => $status) {
    $newkey = ltrim(strstr($domain, '.'), '.');
    $result[$newkey] = $status;
}

echo json_encode($result, JSON_PRETTY_PRINT);

Output:

{
    "biz": "Available",
    "co": "Available",
    "com": "Unavailable",
    "mobi": "Available",
    "net": "Unavailable",
    "org": "Unavailable"
}

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answered Mar 29, 2014 at 12:27

Amal

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6 Comments

Niet the Dark Absol Over a year ago

Of course... .co.uk needs consideration, as do all other TLDs that are locked to the second level. And it'll only get worse come July when .uk opens up at the second level...

Emissary Over a year ago

if "example." is a known constant surely it's better to just strip that?

Amal Over a year ago

@NiettheDarkAbsol: I know it doesn't handle all the corner cases. It's just a nudge in the right direction. The OP should update it with according to his/her requirements. In general, what you said is true :)

Amal Over a year ago

@Emissary: I don't think that's the case. Maybe the OP replaced the actual domain names with example.tld?

Niet the Dark Absol Over a year ago

Hmm... it might be better to assume two-letter domains aren't valid (as they are almost universally restricted to very specific entities) and use a regex based on that. Fewer corner cases, I think.

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