title: grep range of numbers
body: <p>For the following text I need to count the lines that the number between parenthesis is in the range [10-20].</p>
  
  <pre class="lang-none prettyprint-override"><code>    This function's cyclomatic complexity is too high. (1)
      This function's cyclomatic complexity is too high. (2)
      This function's cyclomatic complexity is too high. (3)
      This function's cyclomatic complexity is too high. (4)
      This function's cyclomatic complexity is too high. (5)
      This function's cyclomatic complexity is too high. (6)
      This function's cyclomatic complexity is too high. (7)
      This function's cyclomatic complexity is too high. (8)
      This function's cyclomatic complexity is too high. (9)
      This function's cyclomatic complexity is too high. (10)
      This function's cyclomatic complexity is too high. (12)
      This function's cyclomatic complexity is too high. (13)
      This function's cyclomatic complexity is too high. (14)
      This function's cyclomatic complexity is too high. (15)
      This function's cyclomatic complexity is too high. (16)
      This function's cyclomatic complexity is too high. (17)
  </code></pre>
  
  <p>Im trying the following commands:</p>
  
  <pre><code>cat log.txt | grep -c "This function's cyclomatic complexity is too high. ([10-20])"
  cat log.txt | grep -c "This function's cyclomatic complexity is too high. ([10,11,12,13,14,15,16,17,18,20])"
  </code></pre>
  
  <p>But didnt work. Whats the correct way to do it?</p>