title: Java regex to match multiline records starting with fixed label
body: <p>Following is an example of a list of multiline records, each starting with a fixed string label (<code>LABEL</code>):</p>
  
  <pre><code>&lt;Irrelevant line&gt;
  ...
  &lt;Irrelevant line&gt;
  LABEL ...
  ...
  ...
  LABEL ...
  ...
  ...
  LABEL ...
  ...
  ...
  LABEL ...
  ...
  ...
  </code></pre>
  
  <p>Is there a Java regular expression that can much the above and extract each record, i.e.</p>
  
  <pre><code>LABEL ...
  ...
  ...
  </code></pre>
  
  <p>Also, is this the fastest way of extracting those records, or reading line-by-line and checking the start of the string would yield faster results?</p>