Support \U and \L

[Sharparam]

Replacement string should have support to convert to lowercase and uppercase via \L and \U like so:

TEST STRING
s/.+/\L\0/
test string

[JuanPotato]

Why not implement as a flag so you can use (?L) and s/.+/\0/L

[Sharparam]

Because then you can't apply it to parts of the string.

s/(?<firstname>\w+) (?<lastname>\w+)/\L\g<firstname> \U\g<lastname>/

[Sharparam]

https://www.regular-expressions.info/replacecase.html

[JuanPotato]

You can just add another flag to enable unchanged case. That way you can change whatever throughout the regex.

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[Sharparam]

Flags really doesn't feel like the way this should be implemented. The lowercase/uppercase modifiers is purely for the replacement string, while flags are for the search string.

And all regex engines I've used implement it as described above, why should it be different here?