regex -> negate a word
Wacek Kusnierczyk wrote:
On Sun, Jan 18, 2009 at 2:37 PM, Rau, Roland <Rau at demogr.mpg.de> wrote:
Thank you very much to all of you for your fast and excellent help.
Since the "-grep(...)" solution seems to be favored by most of the answers,
I just wonder if there is really no regular expression which does the job?!?
in perl 5.10, you can try this:
@strings = ("abc", "xyz");
@filtered = grep $_ =~ /(abc)(*COMMIT)(*FAIL)|(*ACCEPT)/, @strings;
which works by making a string that matches the pattern fail, and any
other string succeed despite no match.
incidentally, recent pcre accepts such regexes:
# r code
ungrep = function(pattern, x, ...)
grep(paste(pattern, "(*COMMIT)(*FAIL)|(*ACCEPT)", sep=""), x,
perl=TRUE, ...)
strings = c("abc", "xyz")
pattern = "a[a-z]"
(filtered = strings[ungrep(pattern, strings)])
# "xyz"
vQ