Done by:

(find . -type f -name "*.d" -print0; \
    find . -type f -name "*.dd" -print0) | \
xargs -0 sed -i -r \
    's/\$\(XREF\s+([^(),]*),\s*([^(),]*)\)/$(REF \2, std,\1)/g'

Done by:

from='\$\(XREF_PACK\s+([^(),]*),\s*([^(),]*),\s*([^(),]*)\)'
to='$(REF \3, std,\1,\2)'
(find . -type f -name "*.d" -print0; \
    find . -type f -name "*.dd" -print0) | \
xargs -0 sed -i -r "s/$from/$to/g"

Done by:

arg='\s*([^(),]*)'
from='\$\(XREF_PACK_NAMED\s'$arg','$arg','$arg','$arg'\)'
to='$(REF_ALTTEXT \4, \3, std,\1,\2)'
(find . -type f -name "*.d" -print0; \
    find . -type f -name "*.dd" -print0) | \
xargs -0 sed -i -r "s/$from/$to/g"

Found by: grep -r '$(XREF'

std.experimental.allocator has a custom XREF2. Leaving that as is for now.

Replace XREF with REF