title: Squid dstdom_regex issue
body: <p>I'm trying to add a regular expression dstdomain in to the CF_Unrest ACL in Squid 3.3.12, as follows:</p>
  
  <p><code>acl CF_Unrest dstdom_regex .emlfiles^([0-9])?.com # Dotmailer CDNs</code></p>
  
  <p>The aim is to allow domains .emlfiles1.com through .emlfiles9.com</p>
  
  <p>Squid fails to accept the line, claiming it's bungled:</p>
  
  <p><code>2015/11/13 12:00:34| aclParseAclLine: ACL 'CF_Unrest' already exists with different type.
  FATAL: Bungled /etc/squid/squid.conf line 253: acl CF_Unrest dstdom_regex \.emlfiles^([0-9])?\.com # Dotmailer CDNs</code></p>
  
  <p>How would I go about achieving what is required? </p>