I want to search for \u00FC and replace it with \u00fc
My search regex is: \u([0-9A-F][0-9A-F][0-9A-F][0-9A-F]) and works fine
The replacement \L$1 does lowercase my 4 characters
However, I cannot find a way to write \u (I think vscode wants it to mean uppercase)

It works by using a positive look behind:
In search bar:
Search:
(?<=\\u)((?:[0-9A-F]{4}))Replace:
\L$1The
\\u\L$1works in the Find Replace dialog (Ctrl+F)You can file a bug in the VSC repo