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copied!<p><em>I'll let others go for regex solutions. I'll propose something that hopefully more readable.</em></p> <p>The following code uses my <a href="https://github.com/theraot/paladio/blob/master/paladio/parser.lib.php" rel="nofollow">Parser class from Paladio</a> (it's under CC-BY 3.0), it works on UTF-8. Just download the <a href="https://raw.github.com/theraot/paladio/master/paladio/parser.lib.php" rel="nofollow">raw version of the library</a>, it is made to have no dependencies.</p> <p>The cde is explained in the comments:</p> <pre><code><?php $string = "Hello how are ##you ? I want ##join you."; // now I want replace all ##.... words with <a>##.....</a> //Create a parser object for the string $parser = new Parser($string); //Create a variable to hold the result $result = ''; //While we haven't reached the end of the string while($parser->CanConsume()) { //Take all the text until the next '##' or the end of the string // and add to the result the string taken $result .= $parser->ConsumeUntil('##'); //If we take a '##' if ($parser->Consume('##')) { //Take the text until the next whitespace or new line $tag = $parser->ConsumeUntil(array(' ', "\t", "\r", "\n")); //Add the new converted text to the result $result .= '<a>###'.$tag.'</a>'; } } // example Hello how are <a>##you</a> ? I want <a>##join</a>you. echo $result; ?> </code></pre> <hr> <p>Based on the comments, this is a modified version that will allow to detect words marked with any of the given strings (<code>'##'</code> and <code>'**'</code> in the example):</p> <pre><code>function autolink($ptext, $detc) { // declared whitespace for readability and performance $whitespace = array(' ', "\t", "\r", "\n"); $parser = new Parser($ptext); $result = ''; while($parser->CanConsume()) { $result .= $parser->ConsumeUntil($detc); if ($parser->Consume($detc)) { $newtag = $parser->ConsumeUntil($whitespace); $result .= '<a href='.$newtag.'>'.$newtag.'</a>'; } } return $result; } </code></pre> <p>Example usage:</p> <pre><code>echo autolink("Hello how are ##you ? I want **join you.", array('##', '**')); </code></pre> <p>Outputs:</p> <pre><code>Hello how are <a href=you>you</a> ? I want <a href=join>join</a> you. </code></pre> <p><em>Tested on my local server</em>.</p> <hr> <p><em>Notes</em>:</p> <p>1) The instruction <code>$parser->Consume($detc)</code> will return the found string, so you can use it to branch, example:</p> <pre><code>$input = $parser->Consume(array('a', 'b')); if ($input === 'a') { // do something } else if ($input === 'b') { // do something else } else /*if ($input === null)*/ { // fallback case } </code></pre> <p>2) The supported things to <code>Consume</code> are:</p> <ol> <li>Given strings.</li> <li>Arrays of strings. </li> <li>Numbers (amount of characters).</li> <li>Null (will consume a single character).</li> </ol> <p>3) <code>Parser</code> uses <code>mb_*</code> functions for some of the operations^, and expects <code>UTF-8</code>. If you experience problems with encoding you want to call <code>mb_internal_encoding('UTF-8');</code> before using <code>Parser</code> and convert your string to UTF-8 (I recommend <a href="http://www.php.net/manual/en/function.iconv.php" rel="nofollow"><code>iconv</code></a> for this operation). ^: Some other parts are optimized using byte per byte operations.</p>

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