[Question] Which regex syntax does sd use?

[TornaxO7]

Hello! I'm playing a little bit with sd and tried to execute the following:

echo "some text 123" | sd -p 'some text (?<numbers>{3})' '${numbers}'

I expected to get the output 123 but I'm getting

Error: invalid regex regex parse error:
    some text (?<numbers>{3})
                ^
error: unrecognized flag

instead. According to this cheatsheet I can use

(?<name>...) | Named Capturing Group

for a named group capturing but it doesn't work for sd. Where can I look up the regex syntax which sd uses?

[pinage404]

Hello,

I just tried this

echo "some text 123" | sd --preview 'some text (?P<numbers>[0-9]{3})' 'with named capture group : ${numbers} ; with counted capture group : $1'

And it outputs this :

with named capture group : 123 ; with counted capture group : 123

[pinage404]

sd uses the regex crate

sd/Cargo.toml

Line 15 in ac76b2d

regex = "1.4.3"

which show examples for named capture group

https://github.com/rust-lang/regex/blob/159a63c85eb77ec321301bc4c4ebfb90343edc2b/README.md?plain=1#L37

[TornaxO7]

Oh god, I just needed the --preview arg.... thank you!