Before trying this make sure you back up your wiki, otherwise if it breaks you would lose everything.
I am not sure if you want all tiddlers with the prefix 'Book' to be changed to 'Article' or just some subset of them. I am going to assume all of them. Try this button: <$button>Magical Button of Magic <$list filter='[prefix[Book:]]' variable=OriginalTiddler> <$list filter='[<OriginalTiddler>removeprefix[Book:]addprefix[Article:]]' variable=NewTitle> <$action-setfield $tiddler=<<OriginalTiddler>> title=<<NewTitle>>/> <$action-deletetiddler $tiddler=<<OriginalTiddler>>/> </$list> </$list> </$button> -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/tiddlywiki. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/c0b9f5bf-363f-44aa-be03-8548abc3e90f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.

