Extracting elements from a character vector that contain specific character parts

Question

In the following vector:

x<-c("*D46*E146*N189", "*M420", "*B491*K380", "*Y841*N189*N179", "*K389*E142X")

I would like to extract the elements that contain "E14" and "K38".

That is, I would like to have returned the elements: "*D46*E146*N189", "*B491*K380", and "*K389*E142X".

Does anyone have any suggestion?

score 3 · Accepted Answer · answered Jul 02 '20 at 21:12

3

You can use grep

> grep("E14|K38", x, value = TRUE)
[1] "*D46*E146*N189" "*B491*K380"     "*K389*E142X"

Or indexing using R base grep or grepl

x[grep("E14|K38", x)]
x[grepl("E14|K38", x)]

answered Jul 02 '20 at 21:12

Jilber Urbina

score 2 · Answer 2 · answered Jul 02 '20 at 21:13

2

We can use str_detect

library(stringr)
x[str_detect(x, "E14|K38")]
#[1] "*D46*E146*N189" "*B491*K380"     "*K389*E142X"

answered Jul 02 '20 at 21:13

akrun

2 Answers2