title: python regular expression re.search(r"([a-z]+[A-Z]+[0-9]+)", password)
body: <p>python 2.7</p>
  
  <pre><code>&gt;&gt;&gt;import re
  &gt;&gt;&gt;password="ULFFunH8ni"
  &gt;&gt;&gt;re.search(r"([a-z]+[A-Z]+[0-9]+)", password)
  &lt;_sre.SRE_Match object at 0x7ff5ffd075d0&gt;
  </code></pre>
  
  <p>can match
  but when</p>
  
  <pre><code>&gt;&gt;&gt;password="Fa11con77YES"
  &gt;&gt;&gt;re.search(r"([a-z]+[A-Z]+[0-9]+)", password)
  &gt;&gt;&gt;
  </code></pre>
  
  <p>can't match, I don't know why, can someone help me? thanks!</p>