[R] & and |

[Ivan Calandra]

Thank you Bert for the pointer.

So I guess the solution is:
grep("ConfoMap.+GuineaPigs", mydata, value=TRUE)

This is not the case here, but what if "GuineaPigs" comes before
"ConfoMap"?
Of course I could do two "grep()" calls, but if there a better solution?

Ivan

--
Dr. Ivan Calandra
TraCEr, laboratory for Traceology and Controlled Experiments
MONREPOS Archaeological Research Centre and
Museum for Human Behavioural Evolution
Schloss Monrepos
56567 Neuwied, Germany
+49 (0) 2631 9772-243
https://www.researchgate.net/profile/Ivan_Calandra

On 19/08/2020 17:07, Bert Gunter wrote:
> "&" is not a regex metacharacter.
> See ?regexp
>
> Bert Gunter
>
> "The trouble with having an open mind is that people keep coming along
> and sticking things into it."
> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>
>
> On Wed, Aug 19, 2020 at 7:53 AM Ivan Calandra <calandra using rgzm.de
> <mailto:calandra using rgzm.de>> wrote:
>
>     Dear useRs,
>
>     I feel really stupid, but I cannot understand why "&" doesn't work
>     as I
>     expect, while "|" does.
>
>     I have the following vector:
>     mydata <- c("SSFA-ConfoMap_GuineaPigs_NMPfilled.csv",
>     "SSFA-ConfoMap_Lithics_NMPfilled.csv", 
>     "SSFA-ConfoMap_Sheeps_NMPfilled.csv",
>     "SSFA-Toothfrax_GuineaPigs.xlsx",
>     "SSFA-Toothfrax_Lithics.xlsx", "SSFA-Toothfrax_Sheeps.xlsx")
>     and I want to find the values that include both "ConfoMap" and
>     "GuineaPigs".
>
>     If I do:
>     grep("ConfoMap&GuineaPigs", mydata, value=TRUE)
>     it returns an empty vector, character(0).
>
>     But if I do:
>     grep("ConfoMap|GuineaPigs", mydata, value=TRUE)
>     it returns all the elements that include either "ConfoMap" or
>     "GuineaPigs", as I would expect.
>
>     So what is wrong with my "&" construct? How can I return the elements
>     that include both parts?
>
>     Thank you for your help!
>     Ivan
>
>     -- 
>     Dr. Ivan Calandra
>     TraCEr, laboratory for Traceology and Controlled Experiments
>     MONREPOS Archaeological Research Centre and
>     Museum for Human Behavioural Evolution
>     Schloss Monrepos
>     56567 Neuwied, Germany
>     +49 (0) 2631 9772-243
>     https://www.researchgate.net/profile/Ivan_Calandra
>
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