title: Use regular expression to match ANY Chinese character in utf-8 encoding
body: <p>For example, I want to match a string consisting of <code>m</code> to <code>n</code> Chinese characters, then I can use:</p>
  
  <pre><code>[single Chinese character regular expression]{m,n}
  </code></pre>
  
  <p>Is there some regular expression of a single Chinese character, which could be any Chinese characters that exists?</p>