title: strtok twice a char*
body: <p>I have a file where I get line by line a char* like :</p>
  <p>0   1_12    5_15    6_20</p>
  <p>where every group of digits is separated by a tabulation. I have used strtok function to get every group of tokens as:</p>
  <ul>
  <li>0</li>
  <li>1_12</li>
  <li>5_15</li>
  <li>6_20</li>
  </ul>
  <p>But now, I cannot use strtok again to separate the digits on 1_12 , 5_15 etc...
  I don't want to just use separators=&quot;\t\n_&quot; because I need to get these values to put them into variables, as if the first digit of 1_12 represent an hour and 12 a number of seconds.</p>
  <p>Any Idea of how can I re-use again strtok?</p>
  <p>I have also seen the function strtok_r function but seems to not help me more ...</p>