cut a string after a dot in R : <p>All my column names start with</p>

<pre><code>A.ABC.test1
A.ABC.test2
A.ABC.test3
A.ABC.test4
A.ABC.test5
</code></pre>

<p>I would like to keep only <code>test1</code> , <code>test2</code> ...</p>

<p>Any ideas?</p>
