Actually, I need to replace part of a post, with some new code.
For example, an emoticon was listed as <!--emot
> then the html address for it, then an end tag.
Right now, I'm manually correcting the posts, using the PHPMyAdmin interface.
I have to replace the tags for html links, and the Quote feature.
Another bugger is that the new software requires every post to have a "subject", which is the same as the first post in the thread, preceded by "Re:". (I manually set the first post's subject, because otherwise the thread name are blank. The old software kept the thread title in another table).