CODEWITHSUNDEEP
rregex
BuddhaWithBigBelly
BuddhaWithBigBelly

Reputation: 345

R cant use string in reg expression for grep

when I perform

files <- c("2-16-(-02)_2012","2-16-(-02)_2013","2-16-(+02)_2012","2-16-(+02)_2013")
id <- unique(substr(files,1,10))
year <- unique(substr(files,12,15))
y <- year[1]
i <- id[1]
f1 <- grep(i,files,value = TRUE,perl = TRUE)
f2 <- grep(y,files,value = TRUE,perl = TRUE)

f1 is an empty character, while f2 contains two elements. I need also f1 to contain the two files with the ID.

Upvotes: 0

Views: 37

Answers (1)

Josh
Josh

Reputation: 1278

i has unescaped parentheses in it. Either escape then manually, or change from perl = TRUE to fixed = TRUE.

Upvotes: 3

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