title: Perl regex replace?
body: <p>Why does this work:</p>
  
  <pre><code>$my_str=~s/://g;
  </code></pre>
  
  <p>But this does not:</p>
  
  <pre><code>$my_str=~s/:://g;
  </code></pre>
  
  <p>I have a string that looks something like this: <code>::this:is:my:string</code> and I need to remove the <code>::</code> but not touch the <code>:</code>.</p>