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copied!<p>If you're not entirely sure that the <code>id</code> numbers will decrease numerically, you could actively <em>test</em> for the format of the <code>id</code> (<code>A00</code>) <em>and</em> that the number is less-than <code>100</code>:</p> <pre><code>$('#main > li').filter(function () { var id = this.id; return (/^A\d{2}$/).test(id) && parseInt(id.replace(/[^0-9]/g, ''), 10) < 99; }).each(function(){ // do whatever, for example: this.classList.add('selected'); }); </code></pre> <p><a href="http://jsfiddle.net/davidThomas/2bxaA/" rel="nofollow">JS Fiddle demo</a>.</p> <p>References:</p> <ul> <li>CSS: <ul> <li><a href="http://www.w3.org/TR/selectors/#child-combinators" rel="nofollow">Child (<code>E > F</code>) combinator</a>.</li> </ul></li> <li>JavaScript/DOM: <ul> <li><a href="https://developer.mozilla.org/en-US/docs/Web/API/Element.classList" rel="nofollow"><code>Element.classList</code></a>.</li> <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp" rel="nofollow">JavaScript regular expressions</a>.</li> <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/test?redirectlocale=en-US&redirectslug=JavaScript%2FReference%2FGlobal_Objects%2FRegExp%2Ftest" rel="nofollow"><code>RegExp.test()</code></a>.</li> <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt" rel="nofollow"><code>String.parseInt()</code></a>.</li> <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace" rel="nofollow"><code>String.replace()</code></a>.</li> </ul></li> <li>jQuery: <ul> <li><a href="http://api.jquery.com/filter/" rel="nofollow"><code>filter()</code></a>.</li> </ul></li> </ul>

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