擅长:python、mysql、java
<p>也可以使用<code>re.finditer(r"\d{4}", s)</code></p>
<pre><code>In [38]: import re
In [39]: s = "It was in 1990. Then it was in 1992. Then it was in 2000. Then it was in 2005. Then it was in 2010."
In [40]: ret = re.finditer(r"\d{4}", s)
In [41]: ret.next().group()
Out[41]: '1990'
</code></pre>