You can't. 馃槙
C# Regex doesn't support it.
Alternatively you could right click in the main window list view - and choose "Change casing for selected lines..."
I don't think that would work for him, depending on the regex he wrote...
@teodargent Only thing I could see you doing for this is adding a whole list like:
(\p{Ll} )(a) -> $1A
(\p{Ll} )(b) -> $1B
(\p{Ll} )(c) -> $1C
(\p{Ll} )(d) -> $1D
.....
.....
.....
(\p{Ll} )(z) -> $1Z
Nice workaround! I'll try doing that.