title: RegEx match header with multi-line value
body: <p>I have the email header below :</p>
  
  <pre><code>To: &lt;email@domain.com&gt;
  Subject: =?utf-8?B?dGnDqnUgxJHhu4Ega2jDtG5nIHRp4bq/bmcgdmnhu4d0IGhvw6BuIHRv?=
      =?utf-8?B?w6Bu?=
  Date: Sat, 7 Jun 2014 21:39:10 +0700
  </code></pre>
  
  <p>I using this regex query to match the subject header :</p>
  
  <pre><code>Subject: ([^\r\n]*\r\n  [^\r\n]*)
  </code></pre>
  
  <p>However some case the subject have more and more extra line:</p>
  
  <pre><code>Subject: =?utf-8?B?dGnDqnUgxJHhu4Ega2jDtG5nIHRp4bq/bmcgdmnhu4d0IGhvw6BuIHRv?=
      =?utf-8?B?w6Bu4Ega2jDtG5nIHRp4bq/bmcgdmnhu4d0IGhvw6BuIHRv?=
      =?utf-8?B?w6Bu4Ega2jDtG5nIHRp4bq/bmcgdmnhu4d0IGhvw6BuIHRv?=
  </code></pre>
  
  <p>Or just one line:</p>
  
  <pre><code>Subject: =?utf-8?B?dGnDqnUgxJHhu4Ega2jDtG5nIHRp4bq/bmcgdmnhu4d0IGhvw6BuIHRv?=
  </code></pre>
  
  <p>How can i edit the query to match all case ?</p>