title: Regular Expression with grep or sed does not work
body: <p>I'd like to use regular expression using linux command "grep".
  Currently I have file which looks like this..</p>
  
  <pre><code>X.54(val)(08)(15)(4)
  (32)(0.001)(77)(90)
  X.54(val)(08)(15)(4)
  (33)(0.001)(77)(90)
  X.54(val)(08)(15)(4)
  (34)(0.001)(77)(90)
  </code></pre>
  
  <p>My goal is using a regex which gives me following result</p>
  
  <pre><code>X.54(val)(08)(15)(4)
  (32)
  X.54(val)(08)(15)(4)
  (33)
  X.54(val)(08)(15)(4)
  (34)
  </code></pre>
  
  <p>Currently I'm using this regex </p>
  
  <pre><code>(^\((.*?)\))
  </code></pre>
  
  <p>which works on <a href="https://regexr.com/" rel="nofollow noreferrer">https://regexr.com/</a> fine but using 
  command "grep" or "sed" does not work...</p>
  
  <pre><code>sed -e '/(^\((.*?)\))/gm'
  grep '/(^\((.*?)\))/gm'
  </code></pre>
  
  <p>Can somebody help me....?</p>
  
  <p>Thanks in advance,
  Markus</p>