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    <p>You can use this regex:</p> <pre><code>#(\s|^)((?:https?://)?\w+(?:\.\w+)+(?&lt;=\.(net|org|edu|com))(?:/[^\s]*|))(?=\s|\b)#is </code></pre> <p><strong>Code:</strong></p> <pre><code>$arr = array( 'http://www.domain.com/?foo=bar', 'http://www.that"sallfolks.com', 'This is really cool site: https://www.domain.net/ isn\'t it?', 'http://subdomain.domain.org', 'www.domain.com/folder', 'Hello! You can visit vertigofx.com/mysite/rocks for some awesome pictures, or just go to vertigofx.com by itself', 'subdomain.domain.net', 'subdomain.domain.edu/folder/subfolder', 'Hello! Check out my site at domain.net!', 'welcome.to.computers', 'Hello.Come visit oursite.com!', 'foo.bar', 'domain.com/folder', ); foreach($arr as $url) { $link = preg_replace_callback('#(\s|^)((?:https?://)?\w+(?:\.\w+)+(?&lt;=\.(net|org|edu|com))(?:/[^\s]*|))(?=\s|\b)#is', create_function('$m', 'if (!preg_match("#^(https?://)#", $m[2])) return $m[1]."&lt;a href=\"http://".$m[2]."\"&gt;".$m[2]."&lt;/a&gt;"; else return $m[1]."&lt;a href=\"".$m[2]."\"&gt;".$m[2]."&lt;/a&gt;";'), $url); echo $link . "\n"; </code></pre> <p><strong>OUTPUT:</strong></p> <pre><code>&lt;a href="http://www.domain.com/?foo=bar"&gt;http://www.domain.com/?foo=bar&lt;/a&gt; http://www.that"sallfolks.com This is really cool site: &lt;a href="https://www.domain.net"&gt;https://www.domain.net&lt;/a&gt;/ isn't it? &lt;a href="http://subdomain.domain.org"&gt;http://subdomain.domain.org&lt;/a&gt; &lt;a href="http://www.domain.com/folder"&gt;www.domain.com/folder&lt;/a&gt; Hello! You can visit &lt;a href="http://vertigofx.com/mysite/rocks"&gt;vertigofx.com/mysite/rocks&lt;/a&gt; for some awesome pictures, or just go to &lt;a href="http://vertigofx.com"&gt;vertigofx.com&lt;/a&gt; by itself &lt;a href="http://subdomain.domain.net"&gt;subdomain.domain.net&lt;/a&gt; &lt;a href="http://subdomain.domain.edu/folder/subfolder"&gt;subdomain.domain.edu/folder/subfolder&lt;/a&gt; Hello! Check out my site at &lt;a href="http://domain.net"&gt;domain.net&lt;/a&gt;! welcome.to.computers Hello.Come visit &lt;a href="http://oursite.com"&gt;oursite.com&lt;/a&gt;! foo.bar &lt;a href="http://domain.com/folder"&gt;domain.com/folder&lt;/a&gt; </code></pre> <p><strong>PS:</strong> This regex only supports http and https scheme in URL. So eg: if you want to support ftp also then you need to modify the regex a little.</p>
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    1. COThank you. Unfortunately, this does not detect the URLs at all. Please keep in mind that the URLs need to be found within blocks of normal text. For example, I need to match 'domain.net' in something like "Hello! Check out my site at domain.net!"
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    2. COFrom your example in question it appeared that you just had a list of URLs. Anyway now it is clear, I just edited pls check my answer now.
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    3. COThanks. Your new regex is much closer, except there are two problems. URLs without the http:// are converted to relative links, so for example a URL for something.domain.net would turn into a link like http://www.vertigofx.com/something.domain.net (assuming I had the page hosted at 'www.vertigofx.com') instead of its own absolute link. Also when it matched a URL with a folder path it included some other stuff after it.
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