Extract URLs from text in PHP - php

Question

I have this text:
$string = "this is my friend's website http://example.com I think it is coll";
How can I extract the link into another variable?
I know it should be by using regular expression especially preg_match() but I don't know how?

Answer 1

Probably the safest way is using code snippets from WordPress. Download the latest one (currently 3.1.1) and see wp-includes/formatting.php. There's a function named make_clickable which has plain text for param and returns formatted string. You can grab codes for extracting URLs. It's pretty complex though.
This one line regex might be helpful.
preg_match_all('#\bhttps?://[^\s()<>]+(?:\([\w\d]+\)|([^[:punct:]\s]|/))#', $string, $match);
But this regex still can't remove some malformed URLs (ex. http://google:ha.ckers.org ).
See also:
How to mimic StackOverflow Auto-Link Behavior

Answer 2

I tried to do as Nobu said, using Wordpress, but to much dependencies to other WordPress functions I instead opted to use Nobu's regular expression for preg_match_all() and turned it into a function, using preg_replace_callback(); a function which now replaces all links in a text with clickable links. It uses anonymous functions so you'll need PHP 5.3 or you may rewrite the code to use an ordinary function instead.
<?php
/**
* Make clickable links from URLs in text.
*/
function make_clickable($text) {
$regex = '#\bhttps?://[^\s()<>]+(?:\([\w\d]+\)|([^[:punct:]\s]|/))#';
return preg_replace_callback($regex, function ($matches) {
return "<a href=\'{$matches[0]}\'>{$matches[0]}</a>";
}, $text);
}

Answer 3

URLs have a quite complex definition — you must decide what you want to capture first. A simple example capturing anything starting with http:// and https:// could be:
preg_match_all('!https?://\S+!', $string, $matches);
$all_urls = $matches[0];
Note that this is very basic and could capture invalid URLs. I would recommend catching up on POSIX and PHP regular expressions for more complex things.

Answer 4

The code that worked for me (especially if you have several links in your $string):
$string = "this is my friend's website https://www.example.com I think it is cool, but this one is cooler https://www.stackoverflow.com :)";
$regex = '/\b(https?|ftp|file):\/\/[-A-Z0-9+&##\/%?=~_|$!:,.;]*[A-Z0-9+&##\/%=~_|$]/i';
preg_match_all($regex, $string, $matches);
$urls = $matches[0];
// go over all links
foreach($urls as $url)
{
echo $url.'<br />';
}
Hope that helps others as well.

Answer 5

If the text you extract the URLs from is user-submitted and you're going to display the result as links anywhere, you have to be very, VERY careful to avoid XSS vulnerabilities, most prominently "javascript:" protocol URLs, but also malformed URLs that might trick your regexp and/or the displaying browser into executing them as Javascript URLs. At the very least, you should accept only URLs that start with "http", "https" or "ftp".
There's also a blog entry by Jeff where he describes some other problems with extracting URLs.

Answer 6

preg_match_all('/[a-z]+:\/\/\S+/', $string, $matches);
This is an easy way that'd work for a lot of cases, not all. All the matches are put in $matches. Note that this do not cover links in anchor elements (<a href=""...), but that wasn't in your example either.

Answer 7

You could do like this..
<?php
$string = "this is my friend's website http://example.com I think it is coll";
echo explode(' ',strstr($string,'http://'))[0]; //"prints" http://example.com

Answer 8

preg_match_all ("/a[\s]+[^>]*?href[\s]?=[\s\"\']+".
"(.*?)[\"\']+.*?>"."([^<]+|.*?)?<\/a>/",
$var, &$matches);
$matches = $matches[1];
$list = array();
foreach($matches as $var)
{
print($var."<br>");
}

Answer 9

You could try this to find the link and revise the link (add the href link).
$reg_exUrl = "/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/";
// The Text you want to filter for urls
$text = "The text you want to filter goes here. http://example.com";
if(preg_match($reg_exUrl, $text, $url)) {
echo preg_replace($reg_exUrl, "{$url[0]} ", $text);
} else {
echo "No url in the text";
}
refer here: http://php.net/manual/en/function.preg-match.php

Answer 10

There are a lot of edge cases with urls. Like url could contain brackets or not contain protocol etc. Thats why regex is not enough.
I created a PHP library that could deal with lots of edge cases: Url highlight.
Example:
<?php
use VStelmakh\UrlHighlight\UrlHighlight;
$urlHighlight = new UrlHighlight();
$urlHighlight->getUrls("this is my friend's website http://example.com I think it is coll");
// return: ['http://example.com']
For more details see readme. For covered url cases see test.

Answer 11

Here is a function I use, can't remember where it came from but seems to do a pretty good job of finding links in the text. and making them links.
You can change the function to suit your needs. I just wanted to share this as I was looking around and remembered I had this in one of my helper libraries.
function make_links($str){
$pattern = '(?xi)\b((?:https?://|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:\'".,<>?«»“”‘’]))';
return preg_replace_callback("#$pattern#i", function($matches) {
$input = $matches[0];
$url = preg_match('!^https?://!i', $input) ? $input : "http://$input";
return '' . "$input";
}, $str);
}
Use:
$subject = 'this is a link http://google:ha.ckers.org maybe don't want to visit it?';
echo make_links($subject);
Output
this is a link http://google:ha.ckers.org maybe don't want to visit it?

Answer 12

<?php
preg_match_all('/(href|src)[\s]?=[\s\"\']?+(.*?)[\s\"\']+.*?/', $webpage_content, $link_extracted);
preview

Answer 13

This Regex works great for me and i have checked with all types of URL,
<?php
$string = "Thisregexfindurlhttp://www.rubular.com/r/bFHobduQ3n mixedwithstring";
preg_match_all('/(https?|ssh|ftp):\/\/[^\s"]+/', $string, $url);
$all_url = $url[0]; // Returns Array Of all Found URL's
$one_url = $url[0][0]; // Gives the First URL in Array of URL's
?>
Checked with lots of URL's can find here http://www.rubular.com/r/bFHobduQ3n

Answer 14

public function find_links($post_content){
$reg_exUrl = "/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/";
// Check if there is a url in the text
if(preg_match_all($reg_exUrl, $post_content, $urls)) {
// make the urls hyper links,
foreach($urls[0] as $url){
$post_content = str_replace($url, ' LINK ', $post_content);
}
//var_dump($post_content);die(); //uncomment to see result
//return text with hyper links
return $post_content;
} else {
// if no urls in the text just return the text
return $post_content;
}
}