擅长:python、mysql、java
<p><a href="https://docs.python.org/3/library/re.html#re.sub" rel="nofollow noreferrer"><strong><em>re.sub</em></strong></a>函数具有可选参数<em>count</em>,这是要替换的模式出现的最大数量:</p>
<pre><code>s = '234234-url-slug-1'
result = re.sub(r'^(\d+)-', r'\1/', s, 1)
print(result)
</code></pre>
<p>输出:</p>
^{pr2}$