擅长:python、mysql、java
<p><a href="https://regex101.com/r/rNDktx/2" rel="nofollow noreferrer">See regex in use here</a></p>
<pre><code>(?:(?<=\s)|^)(?:[a-z]|\d+)
</code></pre>
<ul>
<li><code>(?:(?<=\s)|^)</code>确保前面的是空格或行首</li>
<li><code>(?:[a-z]|\d+)</code>匹配单个字母或一个或多个数字</li>
</ul>
<p><code>i</code>标志(<code>re.I</code>在python中)允许<code>[a-z]</code>匹配其大写变体。在</p>
<p><a href="https://tio.run/##FYs9C8IwFAD3/IpHl@ShBkQnsXTo5KqjVQgm2ki@eImI0v8e63Qc3KVPGWPY1Gp9ilSADGME7Ux5iz5ZZwQ1otuJbt8OGacrznJWq@9lGvQCm@W/PCDL88OP5qEc9BTfAXoTiiE4FaXty8N6yxlLZEMRnMtntEGQvNuglXMiIyKr9Qc" rel="nofollow noreferrer">See code in use here</a></p>
^{pr2}$
<p>上面的代码查找正则表达式匹配的所有实例,并将列表项联接到单个字符串中。在</p>
<p>结果:<code>RCCS14</code></p>