validate url with regular expressions [duplicate]

Answer 1

((https?:|[^.])\/\/w{0,3}[.]?google.[a-z]{2,4})|google.[a-z]{2,4}

It is not the prettiest but it works. I've checked with http://regexpal.com/

Answer 2

Try this Expression

/[-a-zA-Z0-9@:%_\+.~#?&//=]{2,256}\.[a-z]{2,4}\b(\/[-a-zA-Z0-9@:%_\+.~#?&//=]*)?/gi

It will aceept all the cases that you have mentioned above

Answer 3

You can directly validate url using filter_var and FILTER_VALIDATE_URL

if (filter_var($url, FILTER_VALIDATE_URL) !== false)

Edit

With Regex

$subject = "http://www.google.com";
$pattern = "/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i";
preg_match($pattern, $subject, $matches);
print_r($matches);

Output

Array ( [0] => http://www.google.com )

Codepad

Answer 4

If you want to create really good domain validator you should get database of domain tlds and make validation for them.

Mozilla has that list: http://mxr.mozilla.org/mozilla-central/source/netwerk/dns/effective_tld_names.dat?raw=1

Here is a python module for that https://github.com/nmmmnu/TLDExtractor

Answer 5

You can try the following

(^(http|https)://)?(www\.)?\w+\.com