title: Regex for words containing letters in alphabetic order JAVA
body: <p>My student(high school) asked me a question about regex matching a word which contains letters in alphabetic order. To be honest I do not know how to create regex such that.
  Example of words matching, size of letters does not matter:</p>
  
  <pre><code>abc, aWZ, gOR, bor
  </code></pre>