[R] grep

[Steven T. Yen]

Thank you all.

On 7/11/2022 10:32 AM, Andrew Simmons wrote:
> ?regex is a nice starting point, it's got plenty of details on meta 
> characters and characters classes, if you need more advanced stuff 
> you'll probably have to look at the perl regex documentation, I 
> believe it's linked in ?regex.
>
> I might try something like
>
> grep("^[xz]\\.")
>
> or
>
> grep("^[xz][.]")
>
> or if you'd consider a different function,
>
> startsWith(jj, "x.") | startsWith(jj, "z.")
>
> On Sun, Jul 10, 2022, 21:49 Steven T. Yen <styen using ntu.edu.tw> wrote:
>
>     Thanks Jeff. It works. If there is a good reference I should read
>     (besides ? grep) I's be glad to have it.
>
>     On 7/11/2022 9:30 AM, Jeff Newmiller wrote:
>     > grep( "^(z|x)\\.", jj, value = TRUE )
>     >
>     > or
>     >
>     > grep( r"(^(z|x)\.)", jj, value = TRUE )
>     >
>     >
>     > On July 10, 2022 6:08:45 PM PDT, "Steven T. Yen"
>     <styen using ntu.edu.tw> wrote:
>     >> Dear, Below, jj contains character strings starting with “z.”
>     and “x.”. I want to grep all that contain either “z.” or “x.”. I
>     had to grep “z.” and “x.” separately and then tack the result
>     together. Is there a convenient grep option that would grep
>     strings with either “z.” or “x.”. Thank you!
>     >>
>     >>> jj<-names(v$est); jj
>     >>   [1] "z.one"     "z.liberal" "z.conserv" "z.dem" "z.rep"
>     "z.realinc"
>     >>   [7] "x.one"     "x.liberal" "x.conserv" "x.dem" "x.rep"
>     "x.realinc"
>     >> [13] "mu1_1"     "mu2_1"     "rho"
>     >>> j1<-grep("z.",jj,value=TRUE); j1
>     >> [1] "z.one"     "z.liberal" "z.conserv" "z.dem" "z.rep" "z.realinc"
>     >>> j2<-grep("x.",jj,value=TRUE); j2
>     >> [1] "x.one"     "x.liberal" "x.conserv" "x.dem" "x.rep" "x.realinc"
>     >>> j<-c(j1,j2); j
>     >>   [1] "z.one"     "z.liberal" "z.conserv" "z.dem" "z.rep"
>     "z.realinc"
>     >>   [7] "x.one"     "x.liberal" "x.conserv" "x.dem" "x.rep"
>     "x.realinc"
>     >>
>     >> ______________________________________________
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>
>     ______________________________________________
>     R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
>     https://stat.ethz.ch/mailman/listinfo/r-help
>     PLEASE do read the posting guide
>     http://www.R-project.org/posting-guide.html
>     <http://www.R-project.org/posting-guide.html>
>     and provide commented, minimal, self-contained, reproducible code.
>
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