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    <p>Instead of using regex, parse it and loop through elements. Try:</p> <pre><code>var data = "&lt;div id='1'&gt;&lt;/div&gt;&lt;div id='asdf'&gt;&lt;input type='text' id='2'/&gt;&lt;/div&gt;", numCompare = 23, div = document.createElement("div"), i, cur; div.innerHTML = data; function updateId(parent) { var children = parent.children; for (i = 0; i &lt; children.length; i++) { cur = children[i]; if (cur.nodeType === 1 &amp;&amp; cur.id) { cur.id = cur.id + "_" + numCompare; } updateId(cur); } } updateId(div); </code></pre> <p><strong>DEMO:</strong> <a href="http://jsfiddle.net/RbuaG/3/" rel="nofollow">http://jsfiddle.net/RbuaG/3/</a></p> <p>This checks to see if the <code>id</code> is set in the first place, and only then will it modify it.</p> <p>Also, it is safe in case the HTML contains a comment node (where IE 6-8 does include comment nodes in <code>.children</code>).</p> <p>Also, it walks through all children of all elements. In your example, you only had one level of elements (no nested). But in my fiddle, I nest the <code>&lt;input /&gt;</code> and it is still modified.</p> <p>To get the get the updated HTML, use <code>div.innerHTML</code>.</p> <p>With jQuery, you can try:</p> <pre><code>var data = "&lt;div id='1'&gt;&lt;/div&gt;&lt;div id='asdf'&gt;&lt;input type='text' id='2'/&gt;&lt;/div&gt;", numCompare = 23, div = $("&lt;div&gt;"), i, cur; div.append(data); div.find("[id]").each(function () { $(this).attr("id", function (index, attr) { return attr + "_" + numCompare; }); }); </code></pre> <p><strong>DEMO:</strong> <a href="http://jsfiddle.net/tXFwh/5/" rel="nofollow">http://jsfiddle.net/tXFwh/5/</a></p> <p>While it's valid to have the <code>id</code> start with and/or be a number, you should change the <code>id</code> of the elements to be a normal identifier.</p> <p>References:</p> <ul> <li><code>.children</code>: <a href="https://developer.mozilla.org/en-US/docs/DOM/Element.children" rel="nofollow">https://developer.mozilla.org/en-US/docs/DOM/Element.children</a></li> <li><code>.nodeType</code>: <a href="https://developer.mozilla.org/en-US/docs/DOM/Node.nodeType" rel="nofollow">https://developer.mozilla.org/en-US/docs/DOM/Node.nodeType</a></li> <li><code>jQuery.find()</code>: <a href="http://api.jquery.com/find/" rel="nofollow">http://api.jquery.com/find/</a></li> <li><code>jQuery.attr()</code>: <a href="http://api.jquery.com/attr/" rel="nofollow">http://api.jquery.com/attr/</a></li> <li><code>jQuery.each()</code>: <a href="http://api.jquery.com/each/" rel="nofollow">http://api.jquery.com/each/</a></li> </ul>
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    1. POJavascript - Regex : How to replace id in string with the same id plus number?
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    1. COThanks for all the info. It worked like a charm. :-)
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