grep

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 at 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"