regexp vs indexOf (v58)

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            <h1 class="page-title">Document.querySelector</h1>
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              <li><a href="#Summary" rel="internal">Summary</a><li><a href="#Syntax" rel="internal">Syntax</a><code></code><code></code><li><a href="#Example" rel="internal">Example</a><code></code><li><a href="#Notes" rel="internal">Notes</a><code></code><code></code><code></code><li><a href="#Browser_Compatibility" rel="internal">Browser compatibility</a><li><a href="#Specification" rel="internal">Specification</a><li><a href="#See_also" rel="internal">See also</a><code></code><code></code><code></code>
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<h2 id="Summary" name="Summary">Summary</h2>
<p>Returns the first element within the document (using depth-first pre-order traversal of the document's nodes) that matches the specified group of selectors.</p>

<h2 id="Syntax" name="Syntax">Syntax</h2>
<pre><em>element</em> = document.querySelector(<em>selectors</em>);</pre>
<p>where</p>
<ul>
  <li><code>element</code> is an <a href="/en-US/docs/DOM/element" title="en-US/docs/DOM/element">element</a> object.</li>
  <li><code>selectors</code> is a string containing one or more CSS selectors separated by commas.</li>
</ul>

<h2 id="Example" name="Example">Example</h2>
<p>In this example, the first element in the document with the class "<code>myclass</code>" is returned:</p>
<pre class="brush: js">var el = document.querySelector(".myclass");
</pre>

<h2 id="Notes" name="Notes">Notes</h2>
<p>Returns <code>null</code> if no matches are found; otherwise, it returns the first matching element.</p>
<p>If the selector matches an ID and this ID is erroneously used several times in the document, it returns the first matching element.</p>
<p>Throws a <code>SYNTAX_ERR</code> exception if the specified group of selectors is invalid.</p>
<p><code>querySelector()</code> was introduced in the Selectors API.</p>

<h2 id="Browser_Compatibility" name="Browser_Compatibility">Browser compatibility</h2>
<p></p><div class="htab"> 
    <a></a> 
    <ul> 
        <li class="selected"><a>Desktop</a></li> 
        <li><a>Mobile</a></li> 
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        <td>Basic support</td>
        <td>1</td>
        <td>3.5 (1.9.1)<br>
          <a class="external" href="https://bugzilla.mozilla.org/show_bug.cgi?id=416317" title="">bug  416317</a></td>
        <td>8</td>
        <td>10</td>
        <td>3.2 (525.3)<br>
          <a class="external" href="https://bugs.webkit.org/show_bug.cgi?id=16587" title="">WebKit bug 16587</a></td>
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        <td>Basic support</td>
        <td>2.1</td>
        <td>yes</td>
        <td>9</td>
        <td>10.0</td>
        <td>3.2</td>
      </tr>
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<h2 id="Specification" name="Specification">Specification</h2>
<ul>
  <li><a class="external" href="http://www.w3.org/TR/selectors-api/" title="http://www.w3.org/TR/selectors-api/">Selectors API</a></li>
</ul>

<h2 id="See_also" name="See_also">See also</h2>
<ul>
  <li><code><a href="/en-US/docs/DOM/document.querySelectorAll" title="/en-US/docs/DOM/document.querySelectorAll">document.querySelectorAll()</a></code></li>
  <li><code><a href="/en-US/docs/DOM/element.querySelector" title="/en-US/docs/DOM/element.querySelector">element.querySelector()</a></code></li>
  <li><code><a href="/en-US/docs/DOM/element.querySelectorAll" title="/en-US/docs/DOM/element.querySelectorAll">element.querySelectorAll()</a></code></li>
  <li><a href="/en-US/docs/Code_snippets/QuerySelector" title="en-US/docs/Code snippets/QuerySelector">Code snippets for querySelector</a></li>
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