title: What does \1 in sed do?
body: <p>I found this question really relevant to what I wanted: <a href="https://stackoverflow.com/questions/3633155/parsing-using-awk-or-sed-in-unix">Parsing using awk or sed in Unix</a>, however I can't figure out what the following does:</p>
  
  <pre><code>'s/\([,=]\) /\1/g'
  </code></pre>
  
  <p>I know that g does a global substitution but really can't understand what's going on within the context of the question.</p>