Sure, here's a lisp that does this. You can change the text to search for/replace with to whatever suits your needs. The routine is case sensitive so if your dimensions actually have VIF you will need to adjust it.
(defun c:del_vif(/ str ss)
(vl-load-com)
(and (ssget "X" '((0 . "*DIM*")));get all dimension objects
(setq ss (vla-get-activeselectionset
(vla-get-activedocument
(vlax-get-acad-object))));use ActiveX ss
(vlax-for x ss
(if (wcmatch (setq str (vla-get-textoverride x)) "*vif*");if it matches this string
(vla-put-textoverride x (vl-string-subst "" "vif" str));replace it with empty string
)
)
)
(princ);exit quietly
)
Jeff