How to delete rows in python pandas DataFrame using regular expressions? : <p>I have a pattern:</p>

<pre><code>patternDel = "( \\((MoM|QoQ)\\))";
</code></pre>

<p>And I want to delete all rows in pandas dataframe where column <code>df['Event Name']</code> matches this pattern. Which is the best way to do it?  There are more than 100k rows in dataframe.</p>
