>  And fixing them via emacs regexes would be an interesting exercise
>  for Ingo. (I personally used Perl, of course, while still a True
>  Believer in character entities)

You can use Perl regular expression search and replace from GNU
Emacs, of course:

     C-x h       ; mark entire buffer
     C-u M-|     ; shell filter on region
     perl -pe's/search/replace/g;' RET

This does not have the advantage of interactivity -- you don't get
the chance to say yes or no to each change, it just changes them all.