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2006 Jun 10
2
Regex engine types
...-D]", letters, value = TRUE, perl = TRUE)
character(0)
So what is it that standard regular expressions use that's different
from Perl-type ones?
The help file for grep refers to POSIX 1003.2 which looked a bit
daunting to delve into. From my limited reading, it seems there are
different gegex "Engine Types" which seems to be getting somewhat
tangential to what I was working on. I could probably avoid problems
if I always set perl=TRUE, but it would be good to know what basic and
extended regular expressions do that's different. If someone has a
quick line or two describi...