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    <p>I agree with @verdesmarald and used this pattern in the following function:</p> <pre><code>$string = preg_replace_callback( "_(?:(?:https?|ftp)://)(?:\S+(?::\S*)?@)?(?:(?!10(?:\.\d{1,3}){3})(?!127(?:\.\d{1,3}){3})(?!169\.254(?:\.\d{1,3}){2})(?!192\.168(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)(?:\.(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)*(?:\.(?:[a-z\x{00a1}-\x{ffff}]{2,})))(?::\d{2,5})?(?:/[^\s]*)?_iuS", create_function('$match',' $m = trim(strtolower($match[0])); $m = str_replace("http://", "", $m); $m = str_replace("https://", "", $m); $m = str_replace("ftp://", "", $m); $m = str_replace("www.", "", $m); if (strlen($m) &gt; 25) { $m = substr($m, 0, 25) . "..."; } return "&lt;a href=\"$match[0]\"&gt;$m&lt;/a&gt;"; '), $string); return $string; </code></pre> <p>It seem to do the trick, and resolve an issue I was having. As @verdesmarald said, removing the ^ and $ characters allowed the pattern to work even in my pre_replace_callback().</p> <p>Only thing that concerns me, is how efficient is the pattern. If used in a busy/high traffic web app, could it cause a bottle neck?</p> <p><strong>UPDATE</strong></p> <p>The above regex pattern breaks if there is a trail dot at the end of the path section of a url, like so <code>http://www.mydomain.com/page.</code>. To solve this I modified the final part of the regex pattern by adding <code>^.</code> making the final part look like so <code>[^\s^.]</code>. As I read it, do not match a trailing space or dot.</p> <p>In my tests so far it seems to be working fine.</p>
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    1. POMaking a url regex global
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    1. COPlease post this as self answer to your question http://stackoverflow.com/questions/14410134/preg-replace-callback-pattern-issue rather than this question.
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    2. CO@nhahtdh Not now I won't, as I've found with further testing this pattern also breaks when faced with a url and bold closing tag like so: `http://mydomain/contact</b>` and if you take the backticks out you'll notice that stackoverflow also has the same fault, like so: http://mydomain/contact</b>
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