> On 17 Sep 2015, at 23:11, Dimitri Liakhovitski
> <dimitri.liakhovit...@gmail.com> wrote:
>
> (x <- c("q10_1", "q10_2", "q10_11", "q12_1", "q12_2", "q13_1", "q13_11"))
>
> # Which strings start with "q10" or "q12? - WORKS
> x[grep("^q10|q12", x)]
>
> # Which strings end with "1"? - WORKS
> x[grep("1$", x)]
>
> # Which strings end with "_1"? - WORKS
> x[grep("\\_1$", x)]
>
> # Which strings start with "q10" AND contain a "1"? - WORKS
> x[grep("^q10.+1", x)]
>
For these last to this should “work”
> # Which strings start with "q10" AND end with a "_1"? - DOES NOT WORK
> x[grep("^q10.+\\_1$", x)]
>
x[grep("^q10.*\\_1$", x)]
> # Which strings start with "q10" or "q12 AND end with "_1"? - WORKS
> INCORRECTLY
> x[grep("^q10|q12.+\\_1$", x)]
>
x[grep("^q10|q12.*\\_1$", x)]
It’s the .+ that’s the problem.
Berend
> Thank you!
> Dimitri Liakhovitski
>
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