Hello all,
   
  I have a matrix whose column names look like
   
  a1  a2  b1  b2  b3  c1 c2
  1   2    3    7    1    3   2
  4   6    7    8    1    4   3
   
  Now, I can have any number of a's. not just two as shown above and same goes for b's and c's.  I need to extract all the a's columns and put them in another matrix, extract all b's columns and put them in some matrix and same goes for "c". How can I identify such pattern and get subsets of this matrix depending on columns names?
   
  I will appreciate a quick reply.
  Thanks  a lot.

       
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