擅长:python、mysql、java
<p>尝试:</p>
<pre class="lang-py prettyprint-override"><code>df.loc[df.sentences.str.contains(r"([^\w]|^)\w([^\w]|$)")]
</code></pre>
<p>产出:</p>
<pre class="lang-py prettyprint-override"><code> sentences
0 hi, how are; you z
1 im w good thanks
2 How am I
5 K hello, alex how are you !
6 it is a car
</code></pre>