title: delete lines with sed match a special regex
body: <p>I try to delete all lines that begin with some optional special chars followed by <code>blubb</code>:</p>
  <p>That's the lines I want to match:</p>
  <blockquote>
  <p>#blubb<br />
  *blubb<br />
  -blubb<br />
  blubb</p>
  </blockquote>
  <p>That should do it, but doesn't work :(</p>
  <pre><code>sed &quot;/^.?blubb$/d&quot; -i special.conf  
  sed &quot;/^[#*-]?blubb$/d&quot; -i special.conf  
  </code></pre>
  <p>Has somebody the <strong>right solution</strong>?</p>