Question: Backreference possible?

[silvio]

with perlre it is possible to (back-)reference a capture group. Is this possible with this crate? Iwant to write regex like r"(.)(.)\2\1".

Thanks in advance,
Silvio

[BurntSushi]

Nope. The first sentences of the documentation explain why:

This crate provides a native implementation of regular expressions that is heavily based on RE2 both in syntax and in implementation. Notably, backreferences and arbitrary lookahead/lookbehind assertions are not provided. In return, regular expression searching provided by this package has excellent worst-case performance.

[silvio]

Hups! Sorry! ... and thanks

[JarvisCraft]

Hi @BurntSushi!

Feels like the link is dead and it would be good to update it given that this issue occurs among the first ones in Google for queries like rust rg backreference

[BurntSushi]

Fixed, thanks. Note that the answer is still literally in the first paragraph of the crate documentation.

[JarvisCraft]

Thanks!

Note that the answer is still literally in the first paragraph of the crate documentation.

For sure :) It's just a small improve to enhance Google'ability (e.g. I knew this fact, but just wanted to make a quick check)