How to Validate Domain Name in PHP

How to validate a domain name using Regex & PHP?

How about:

^(?:[-A-Za-z0-9]+\.)+[A-Za-z]{2,6}$

How to validate domain name without http or https in PHP?

You can use parse_url() to split URL into logical parts and than validate only part you need by regexp.

http://php.net/parse_url

php preg_match validate domain

 if (preg_match("!"#$%&\'()*+,-./@:;<=>[\\]^_`{|}~", $myString)) 
    {
       //valid url
    }

This should do...

How to validate a correct domain name and sub domain in php

First, manually strip out the www. then just make sure it is in the form domain.tld or something.domain.tld

$domain = str_replace('www.','',$domain);

if(preg_match('/([a-zA-Z0-9\-_]+\.)?[a-zA-Z0-9\-_]+\.[a-zA-Z]{2,5}/',$domain))
//valid domain

Regex to validate domain name without top-level domain using preg_match

The answer to the problem is changing the pattern to:

$pattern = "(\A[a-zA-Z0-9](?:[a-zA-Z0-9\d-]*[a-zA-Z0-9])+\z)";

Which doesn't allow hyphens at the beginning or the end of the domain, doesn't allow any TLDs, and any other special characters.

How to validate email address by domain using PHP?

TRY with checkdnsrr extract the domain name from the email address and pass to the checkdnsrr.

Returns TRUE if domain name are found; returns FALSE if no domain name
were found or if an error occurred.

$domainname = "domain.com";

checkdnsrr($domainname , "A");

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