title: How to parse a string for an integer matrix in Objective C
body: <p>Can someone help me extracting a 2D matrix of integers from a string like the one below in Objective C?</p>
  
  <p>1  1  0  0 -1</p>
  
  <p>-1  0  1  1  0</p>
  
  <p>0 -1  0  1  0</p>
  
  <p>0  0 -1 -1  1</p>