Ideone.com

fork download

some_string <- "1_2018_start_2007_3_end"
sub(".*?_(\\d{4})_.*", "\\1", some_string) # leftmost
sub(".*_(\\d{4})_.*", "\\1", some_string) # rightmost

Success #stdin #stdout 0.16s 175424KB

stdin

Standard input is empty

stdout

[1] "2018"
[1] "2007"

https://ideone.com/3hyjeK

language:

R (R 3.5.2)

created:

visibility:

public

Share or Embed source code

The brand new service which powers Ideone!

Widget for compiling and running the source code in a web browser!