Your solution is nice and Perlish, but (if you care), I would have implemented it like this:
find /the/start/dir -type f -exec perl -i~ \
-e 's/origtext/changedtext/g;print' {} \;
If you wanted to limit it to html files only, then a
find /the/start/dir -type f -name '*.html' ...
would have worked. In fact, using sed or tr instead of Perl would work, 'cept I don't know how to do inplace editing with them.
Of course, this doesn't have the reusability factor of your solution; but in this case I would have sacrificed it for quickness.
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