title: replace character in complex pattern
body: <p>I have data in file like:</p>
  
  <pre><code>1436387515496;Si gnal;strength;- 120;-160;-120 ;-1;-1;1;0.05. 789123;45.2285962  1436387523254;Si gnal;strength;- 120;-160;-120 ;-1;-1;1;10762 .05.7893792;45.2285062 1436387533164;Signal;stren gth;-120;-160 ;-120;-1;-1;0 ;10902.05.789335 ;45.228513143638 7536029;Signal;s trength;-120;- 160;-120;-1;- 1;1;3296.05.789 335;45.228513 1436387543135;Si gnal;
  </code></pre>
  
  <p>I want to add a new line (\r\n) every 13 characters before ";Si", any idea ?</p>
  
  <p>PS: I don't know if we can use "sed" because all the file is in one line.</p>
  
  <p>PS2: The 13 characters before ";Si" are always numbers.</p>
  
  <p>Thanks</p>