title: what does string matching "s/\r\n/ /g" mean in perl
body: <p>Can someone explain what does this string matching command do in Perl</p>
  
  <pre><code> $CAD_Line=~s/\r\n/ /g;
  </code></pre>
  
  <p>where can I get additional information on this type of matching?(What do I search for?)</p>