CODEWITHSUNDEEP
rtidyversesubsettidyrgrepl
SUMIT
SUMIT

Reputation: 563

Filter & Subset if a String Contains Certain Characters at specific position (in R)

I currently wish to subset a data frame if it contains any numbers from 01 to 12 at 11-12 position (if we also consider - as a character then the position will be 14-15th position). I tried grepl but was not able to do it successfully.

Data sample:

x <- data.table(c('ACCN-NJ-A55O-01A-11D-A25L-08','ACCN-NJ-A55O-11D-11D-A25L-08', 'ACCN-05-4249-01A-01D-1105-08', 'ACCN-S2-AA1A-15C-12D-A397-08'))

Expected Output (row number 1, 2 and 3 will returned):

ACCN-NJ-A55O-01A-11D-A25L-08
ACCN-NJ-A55O-11D-11D-A25L-08
ACCN-05-4249-01A-01D-1105-08

Any help would be appreciated. Thanks in advance

Upvotes: 0

Views: 1084

Answers (2)

hello_friend
hello_friend

Reputation: 5788

Using square bracket subsetting:

x[as.integer(substr(x$V1, 14, 15)) <= 12,]

Upvotes: 1

Ronak Shah
Ronak Shah

Reputation: 388982

If the position is fixed you can use substr/substring to extract string at specific position.

subset(x, as.integer(substr(V1, 14, 15)) <= 12)

#                             V1
#1: ACCN-NJ-A55O-01A-11D-A25L-08
#2: ACCN-NJ-A55O-11D-11D-A25L-08
#3: ACCN-05-4249-01A-01D-1105-08

Using dplyr -

library(dplyr)
x %>% filter(between(as.integer(substr(V1, 14, 15)), 1, 12))

Upvotes: 2

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