title: Convert regular expression to CFG
body: <p>How can I convert some regular language to its equivalent Context Free Grammar?
  Is it necessary to construct the DFA corresponding to that regular expression or is there some rule for such a conversion?</p>
  
  <p>For example, consider the following regular expression </p>
  
  <blockquote>
    <p>01+10(11)<sup>*</sup></p>
  </blockquote>
  
  <p>How can I describe the grammar corresponding to the above RE?</p>