On 13/02/2014 16:25, Rainer M Krug wrote:
On 02/13/14, 17:23 , jim holtman wrote:
use the "|" in regular expressions:
grep(c("an|em|eb", month.name <http://month.name/>)
Thanks - again a reason to learn regexp.
Note though that is an *extended* regex. They are the default in R, but
not for grep, sed, ....
Another thing to watch out is that GNU grep allows (a\|b\|c) in 'basic'
regexps -- but the POSIX standard does not, and nor do other
implementations. The authors of the graphviz configure code (shipped
with Rgraphviz) did not know this and wasted other people's resources.
Cheers,
Rainer
Jim Holtman
Data Munger Guru
What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.
On Thu, Feb 13, 2014 at 9:43 AM, Rainer M Krug <rai...@krugs.de
<mailto:rai...@krugs.de>> wrote:
Hi
I want to search for multiple pattern as grep is doing for a single
pattern, but this obviously not work:
> grep("an", month.name <http://month.name>)
[1] 1
> grep("em", month.name <http://month.name>)
[1] 9 11 12
> grep("eb", month.name <http://month.name>)
[1] 2
> grep(c("an", "em", "eb"), month.name <http://month.name>)
[1] 1
Warning message:
In grep(c("an", "em", "eb"), month.name <http://month.name>) :
argument 'pattern' has length > 1 and only the first element will
be used
>
Is there an equivalent which returns the positions as grep is doing, but
not using the strict full-string matching of match()?
I could obviously do:
> unlist( sapply(pat, grep, month.name <http://month.name> ) )
an em1 em2 em3 eb
1 9 11 12 2
but is there a more compact command I am missing?
Thanks,
Rainer
--
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)
Centre of Excellence for Invasion Biology
Stellenbosch University
South Africa
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