r - Specific substring detection into a large string -


i have kind of data column in character matrix. apply column v1 grep function detect "ok", "error" or "noise" strings, , save them new column.

from img 1 

"";"v1" "img1";"19293.jpg : h344.8º : ok" "img1";"19293.jpg : 9.6kt : ok" "img1";"19293.jpg : 44º31.449h'n : error" "img1";"19293.jpg : 2º31.238'w : ok"  "img2";"19294.jpg : h344.8º : ok" "img2";"19294.jpg : 9.6kt : ok" "img2";"19294.jpg : 44º31.449h'n : noise" "img2";"19294.jpg : 2º31.238'w : ok"  "img3";"19295.jpg : h344.8º : ok" "img3";"19295.jpg : 9.6kt : ok" "img3";"19295.jpg : 44º31.449h'n : ok" "img3";"19295.jpg : 2º31.238'w : ok"

...

until img n

thanks!

read in data file with

x <- read.table( "data.dat", sep = ";", header = true )

add column last word of x$v1

library( stringr ) x$extr <- word( x[,2], -1 ) x       x                               v1  extr 1  img1         19293.jpg : h344.8º : ok    ok 2  img1           19293.jpg : 9.6kt : ok    ok 3  img1 19293.jpg : 44º31.449h'n : error error 4  img1      19293.jpg : 2º31.238'w : ok    ok 5  img2         19294.jpg : h344.8º : ok    ok 6  img2           19294.jpg : 9.6kt : ok    ok 7  img2 19294.jpg : 44º31.449h'n : noise noise 8  img2      19294.jpg : 2º31.238'w : ok    ok 9  img3         19295.jpg : h344.8º : ok    ok 10 img3           19295.jpg : 9.6kt : ok    ok 11 img3    19295.jpg : 44º31.449h'n : ok    ok 12 img3      19295.jpg : 2º31.238'w : ok    ok

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