title: Why this regex does not accept zero?
body: <p>I have this regular expression:</p>
  <pre><code>(1*+0)
  </code></pre>
  <p>I tested it Regex Buddy's Test module, and it highlighted these:</p>
  <p><img src="https://i.stack.imgur.com/MyOze.png" alt="regular expression: 1*+0" /></p>
  <p>It does not recognize the string: <em>0</em>, neither <em>1001</em>, &amp;c.</p>
  <p>Why the zero (0) character is not considered?</p>
  <p>Thanks in advance!</p>
  <p>N.B.: I tested the same regex and the same data in Notepad++, but it does work, too.</p>