使用 R 正则表达式识别两个字符，后跟一个破折号和两个数字

Question

Very obnoxious regex question incoming. I have a column that I am trying to split into two based off a condition, I'd like a new column to be created when there are two characters. followed by a dash and two numbers (eg,, CA-01 ).

My code is:

mydf %>% extract(col = pilot_id, regex = "[az]{2}.d{2}", into = 'facility_test')

Where the column I'd like to identify the pattern in is pilot_id , and the new column I'd like to make is facility_test .

Answer 1

We need to capture in extract

library(dplyr)
library(tidyr)
mydf %>%
  extract(col = pilot_id,  regex = ".*-([A-Z]{2}-\\d{2})\\s.*", 
     into = 'facility_test')

# A tibble: 1 x 1
#    facility_test
#  <chr>        
#1 FL-03       

data

mydf <- tibble(pilot_id = "TGT Track -FL-03 (Hilsborough County) 3/3/2021")