match url pattern in php using regular expression

Question

I want to match a url link in wall post and replace this link with anchor tag, for this I use the regular expression below.

I would like the match 4 types of url:

1. http://example.com
2. https://example.com
3. www.example.com
4. example.com

preg_replace('@(https?://([-\w\.]+)+(:\d+)?(/([\w/_\.]*(\?\S+)?)?)?)@',
             '<a href="$1">$1</a>', $subject);

This expression matches only first two types of url.

If I use this expression for match url pattern '@(www?([-\w\.]+)+(:\d+)?(/([\w/_\.]*(\?\S+)?)?)?)@', then it only matches the third type of url pattern.

How can I match all four type of url pattern with a single regular expression?

Answer 1

I looked around and didn't see any that were exactly what I needed. I found this one that was close, so i modified it as follows:

^((([hH][tT][tT][pP][sS]?)\:\/\/)?([\w\\-]+(\[\w\.\&%\$\-]+)*)?((([^\s\(\)\<\>\\\"\.\   [\]\,;:]+)(\.[^\s\(\)\<\>\\\"\.\[\]\,;:]+)*(\.[a-zA-Z]{2,4}))|((([01]?\d{1,2}|2[0-4]\d|25[0-5])\.){3}([01]?\d{1,2}|2[0-4]\d|25[0-5])))(\b\:(6553[0-5]|655[0-2]\d|65[0-4]\d{2}|6[0-4]\d{3}|[1-5]\d{4}|[1-9]\d{0,3}|0)\b)?((\/[^\/][\w\.\,\?\'\\\/\+&%\$#\=~_\-]*)*[^\.\,\?\"\'\(\)\[\]!;<>{}\s\x7F-\xFF])?)$

check it out on debuggex.

Answer 2

If you want to make that one work you need to make the "https?//" part optional, since you seem to have a fairly good grasp of regexps I won't show you, an excerise for the reader :)

But I generally agree with Nev, it's overly complicated for what it does.

Answer 3

use this pattern .

$regex = "(https?\:\/\/|ftp\:\/\/|www\.|[a-z0-9-]+)+([a-z0-9-]+)\.+([a-z]{2,4})((\/|\.)+([a-z0-9-_.\/]*)$|$)";

hope that helpful .

Answer 4

I'd use a different regex to be honest. Like this one that Gruber posted in 2009:

\b(([\w-]+://?|www[.])[^\s()<>]+(?:\([\w\d]+\)|([^[:punct:]\s]|/)))

or this updated version that Gruber posted in 2010 (thanks, @IMSoP):

(?i)\b((?:[a-z][\w-]+:(?:/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'".,<>?«»“”‘’]))

Answer 5

My two cents (five years later!):

preg_match("/^((https|http|ftp)\:\/\/)?([a-z0-9A-Z]+\.[a-z0-9A-Z]+\.[a-z0-9A-Z]+\.[a-zA-Z]{2,4}|[a-z0-9A-Z]+\.[a-z0-9A-Z]+\.[a-zA-Z]{2,4}|[a-z0-9A-Z]+\.[a-zA-Z]{2,4})$/i", $url)

Hope it helps someone

Answer 6

A complete working example using Nev Stokes given link:

public function clickableUrls($html){
    return $result = preg_replace(
        '%\b(([\w-]+://?|www[.])[^\s()<>]+(?:\([\w\d]+\)|([^[:punct:]\s]|/)))%s',
        '<a href="$1">$1</a>',
        $html
    );
}