擅长:python、mysql、java
<p>也许您只需要调用<code>.group()</code>方法:</p>
<pre><code>import re
line = '(<layerThickness> 0.58 </layerThickness>)'
L = re.search(r"([-+]?[0-9]*\.?[0-9]+)", line).group(0)
print(L)
</code></pre>
<p>收益率</p>
<pre><code>0.58
</code></pre>