Dear Steven,
Beyond ?regex, the Wikipedia article on regular expressions
<https://en.wikipedia.org/wiki/Regular_expression> is quite helpful and
not too long.
I hope this helps,
John
On 2022-07-10 9:43 p.m., Steven T. Yen 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" <st...@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@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
John Fox, Professor Emeritus
McMaster University
Hamilton, Ontario, Canada
web: https://socialsciences.mcmaster.ca/jfox/
______________________________________________
R-help@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
and provide commented, minimal, self-contained, reproducible code.
