[R] Subset using partial values

[Newbie19_02]

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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