title: Override Maven's default resource filter replacement pattern
body: <p>By default maven will filter resources like this:</p>
  
  <pre><code>&lt;properties&gt;
    &lt;replace.me&gt;value&lt;/replace.me&gt;
  &lt;/properties&gt;
  
  &lt;some-tag&gt;
    &lt;key&gt;${replace.me}&lt;/key&gt;
  &lt;/some-tag&gt;
  </code></pre>
  
  <p>will get you:</p>
  
  <pre><code>&lt;some-tag&gt;
    &lt;key&gt;value&lt;/key&gt;
  &lt;/some-tag&gt;
  </code></pre>
  
  <p>Is there a way to override the way maven selects the strings to replace? Specifically, I want to be able to use this:</p>
  
  <pre><code>&lt;some-tag&gt;
    &lt;key&gt;@replace.me@&lt;/key&gt;
  &lt;/some-tag&gt;
  </code></pre>
  
  <p>to get the same result as above.</p>