There is a version 5.0d around, further down the page where you linked in your other post, it seems to address the issue.
v5.0d ??cadffm??
;;;; Revised regular expression for Height format -
;;;; e.g. for format like this: H0.400000
Also, John Uhden has an Unformat LISP he mentions in the same thread, that might do what you need.
Please post your amended code if you don't mind, others may find it helpful.