About Python MatchObject
<p>I'm learning Python regular expressions and I have a question: all books and Python documents I have read tell me that <code>re.search</code> returns a <code>MatchObject</code> or <code>None</code>.</p>

<p>My question is where is the definition of <code>MatchObject</code>? What class does <code>MatchObject</code> belongs to? When I use <code>help(matchObj)</code>, it prints <code>&lt;'_sre.SRE_Match'&gt;</code>. What is this?</p>
