title: Returning substring of string after first occurence of a comma
body: <p>How can I take this input CSV file: </p>
  
  <pre><code>0,1
  1,2
  3,4
  5,6,7
  8,10
  9,10
  </code></pre>
  
  <p>and return only the substring of each line after the first occurrence of "," so that my output is:</p>
  
  <pre><code>1
  2
  4
  6,7
  10
  10
  </code></pre>
  
  <p>I can only figure out how to parse the string within a certain range after splitting by commas, so I am using <code>string.split(",")[1]</code> to return everything after the first comma and before the next comma but I can't figure out how to get everything after the first comma.  So for the inputs with more than one comma, I'm missing data.</p>