title: replacing a string using SED doesn't work
body: <p>Consider this line:</p>
  
  <pre><code>--dump-config=h264_sss-l2-2-ghb-16-500.ini --stats-file=h264_sss-l2-2-ghb-16-500.stat configs/example/cmp.py --l2cache -b h264_sss
  </code></pre>
  
  <p>and this string "l2-2-ghb-16". To change that string with SED, I ran this command:</p>
  
  <pre><code>sed  's/l2-.*-.*-.*-/l2-2-ghb-8-m-/g'
  </code></pre>
  
  <p>But the whole line then changed to </p>
  
  <pre><code>--dump-config=h264_sss-l2-2-ghb-8-m-b h264_sss
  </code></pre>
  
  <p>What is the problem</p>