correctly highlight register names
correctly highlight register names

The regular expression to detect suffixed hexadecimal numbers was wrong
and including registers ah, bh, ch, dh.

Thanks to Lyle Putnam for the patch.

BUG: 278375

hlamer/kate,hlamer/kate,cmacq2/kate,hlamer/kate,hlamer/kate,hlamer/kate,hlamer/kate,hlamer/kate,cmacq2/kate,DickJ/kate,DickJ/kate,DickJ/kate,hlamer/kate,cmacq2/kate,sandsmark/kate,sandsmark/kate,jfmcarreira/kate,sandsmark/kate,sandsmark/kate,jfmcarreira/kate,jfmcarreira/kate,hlamer/kate,hlamer/kate,DickJ/kate