[R] Regexp bug or misunderstanding

[Martin Møller Skarbiniks Pedersen]

Hi,

   Have I found a bug in R? Or misunderstood something about grep() ?

   Case 1 gives the expected output
   Case 2 does not gives the expected output.
   I expected integer(0) also for this case.

case 1:
grep("[:digit:]", "**ABAAbabaabackabaloneaban")
integer(0)

case 2:
grep("[:digit:]", "**ABAAbabaabackabaloneaband")
[1] 1

Regards
Martin