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Jim, thanks very much for the reply. However, I don't get anything returned if I run this on my test.txt file (as in the first post, space delimited). I also got an error in the pattern matching in...

I am trying to print columns from a table whose name (header) matches a certain string.

E.g.,

patient1001 patient1002 patient2005 patient3005 patient4001
0 0 0 0 0
2 9 2 8 3
2 7 3 0 2
...