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copied!<p>Since <a href="https://stackoverflow.com/a/1277583/1503784">javascript doesn't seem to support negative look-behind</a>, you will have to trick it by using a replace function. Capture the <code>href</code> (maybe you should also also consider <code>src</code>) :</p> <pre><code>function repl(text) { var exp = /((href|src)=["']|)(\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig; return text.replace(exp, function() { return arguments[1] ? arguments[0] : "<a href=\"" + arguments[3] + "\">" + arguments[3] + "</a>" }); } </code></pre> <p>See the <a href="http://jsfiddle.net/VGVhv/" rel="nofollow noreferrer">demo</a></p> <p><strong>EDIT</strong></p> <p>A "better" version which will only replace links in actual text nodes:</p> <pre><code>function repl(node) { var exp = /(\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/i; var nodes=node.childNodes; for (var i=0, m=nodes.length; i<m; i++){ var n=nodes[i]; if (n.nodeType==n.TEXT_NODE) { var g=n.textContent.match(exp); while(g) { var idx=n.textContent.indexOf(g[0]); var pre=n.textContent.substring(0,idx); var t=document.createTextNode(pre); var a=document.createElement("a"); a.href=g[0]; a.innerText=g[0]; n.textContent = n.textContent.substring(idx+g[0].length); n.parentElement.insertBefore(t,n); n.parentElement.insertBefore(a,n); g=n.textContent.match(exp); } } else { repl(n); } } } var r=repl(document.getElementById("t")) </code></pre> <p> See the <a href="http://jsfiddle.net/mAJkL/" rel="nofollow noreferrer">demo</a></p>

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