On 09/10/2017 12:06 PM, William Dunlap wrote:
"(^| +)([^/ ]*/?){0,2}", with the first "*" replaced by "+" would be a
bit better.
Thanks! I think I actually need the *, because theoretically the b part
of the word could be empty, i.e. "a//c" would be legal and should become
"c".
Duncan Murdoch
Bill Dunlap
TIBCO Software
wdunlap tibco.com <http://tibco.com>
On Mon, Oct 9, 2017 at 8:50 AM, William Dunlap <wdun...@tibco.com
<mailto:wdun...@tibco.com>> wrote:
> x <- "f 147/1315/587 2820/1320/587 3624/1321/587 1852/1322/587"
> gsub("(^| *)([^/ ]*/?){0,2}", "\\1", x)
[1] " 587 587 587 587"
> y <- "aa aa/ aa/bb aa/bb/ aa/bb/cc aa/bb/cc/ aa/bb/cc/dd
aa/bb/cc/dd/"
> gsub("(^| *)([^/ ]*/?){0,2}", "\\1", y)
[1] " cc cc/ cc/dd cc/dd/"
Bill Dunlap
TIBCO Software
wdunlap tibco.com <http://tibco.com>
On Mon, Oct 9, 2017 at 8:02 AM, Duncan Murdoch
<murdoch.dun...@gmail.com <mailto:murdoch.dun...@gmail.com>> wrote:
I have a file containing "words" like
a
a/b
a/b/c
where there may be multiple words on a line (separated by
spaces). The a, b, and c strings can contain non-space,
non-slash characters. I'd like to use gsub() to extract the c
strings (which should be empty if there are none).
A real example is
"f 147/1315/587 2820/1320/587 3624/1321/587 1852/1322/587"
which I'd like to transform to
" 587 587 587 587"
Another real example is
"f 1067 28680 24462"
which should transform to " ".
I've tried a few different regexprs, but am unable to find a way
to say "transform words by deleting everything up to and
including the 2nd slash" when there might be zero, one or two
slashes. Any suggestions?
Duncan Murdoch
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