Bahai9:Converting between HTML and Wiki code
From Bahai9
Since Mediawiki does not generally allow HTML code, and as it may sometimes be necessary to migrate HTML pages to wiki code (the reverse can be done easily by viewing the source code for any resulting Wiki page).
To strip HTML entirely out of pages, see http://www.gpgstudy.com/striphtml.php
See converting pages by wildcard replaces for general tips on making wildcard replacements (including the need to back-up files first.
After reading the above page on wildcards, a specific wildcard replacement (for MS Word for Mac at least) which could be useful is the following (remove both quotation marks if the file does not use them in "href"): (\<a href=")(*)("\>)(*)(\</a\>) and replace it with [\2 \4]
That's all!