擅长:python、mysql、java
<p>您可以使用<a href="https://www.rexegg.com/regex-lookarounds.html" rel="nofollow noreferrer">lookback</a>:</p>
<pre><code>>>> text = "I need help. I need 5.4 dollar."
>>> re.sub(r'(?<=\D)\.', '\n', text)
'I need help\n I need 5.4 dollar\n'
</code></pre>
<p>在本例中,<code>(?<=\D)</code>断言文字<code>.</code>前面的字符不是数字。你知道吗</p>