Regex not capturing correct group [duplicate]

Question

I need to capture the third instance of a pattern using regex. My code works using the online R Regex Tester, but not with the stringr::str_extract() function.

What is the reason for this?

string = c("W901 Z846 W903 Z846 W919 Z846 Z941")

str_extract(string, "^(?:.*?Z84[1-9]{1}){2}(.*?Z84[1-9]{1})")

# [1] "W901 Z846 W903 Z846 W919 Z846"

Result should be: "W919 Z846".

See this R Regex Tester result where the correct result is returned.

It works with strcapture in base R: strcapture(pat, string, list(x = character())) — G. Grothendieck
– G. Grothendieck, Commented Oct 5 at 0:55

JisL · Accepted Answer · 2025-10-03 16:03:18Z

0

The regex captures a group. I realised I can display this captured group using the group = 1 option in the `str_extract()` function

answered Oct 3 at 16:03

JisL

3331 silver badge9 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Regex not capturing correct group [duplicate]

1 Answer 1

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Linked

Related