title: Looking for a string with regex and delete the whole line
body: <p>I am trying to find in Textpad a character with regex (for example "#") and if it is found the whole line should be deleted. The # is not at the beginnen of the line nor at the end but somewehre in between and not connected to another word, number or charakter - it stands alone with a whitespace left and right, but of course the rest of the line contains words and numbers.</p>
  
  <p>Example:</p>
  
  <pre><code>My first line
  My second line with # hash
  My third line# with hash
  </code></pre>
  
  <p>Result:</p>
  
  <pre><code>My first line
  My third line# with hash
  </code></pre>
  
  <p>How could I accomplish that?</p>