title: Java regex: newline + white space
body: <p>should be simple, but I'm going crazy with it. </p>
  
  <p>Given a text like:</p>
  
  <pre><code>line number 1
  line number 2
   line number 2A
  line number 3
   line number 3A
   line number 3B
  line number 4
  </code></pre>
  
  <p>I need the Java regex that deletes the line terminators then the new line begin with space, so that the sample text above become:</p>
  
  <pre><code>line number 1
  line number 2line number 2A
  line number 3line number 3Aline number 3B
  line number 4
  </code></pre>