Hi,
That was a good suggestion but I should have been more specific,
PROCHI Date_admission main_condition
CAO3121534 15/08/2006 I501
28394 CAO3121534 18/04/1999 I251
28395 CAO3121534 18/10/1993 4109
28396 CAO3121534 19/01/1988 71946
28397 CAO3121534 20/04/1999 I251
28398 CAO3121534 21/04/1999 I251
28399 CAO3121534 21/05/1998 Z048
28400 CAO3121534 21/10/1993 4109
28401 CAO3121534 25/02/2002 R634
28402 CAO3121534 26/01/2003 B349
28403 CAO3121534 27/08/1998 M179
28404 CAO3121534 28/05/1999 I501
28405 CAO3121534 30/09/1997 I259
28406 CAO3121534 31/08/2007 H830
28407 CAO3121560 07/07/2000 D688
So let's say that I want to subset but only by characters beginning with 410
and I25?
grep returns any character containing the pattern and so is not entirely
suitable to the extended example. Though it works almost perfectly. Is
there a way to make it match the first three letters?
THanks,
Natalie
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