Is there a specific reason why you need nested lists? Do you want the tiddler titles or the text that matches the regexp?
[tag[DailyNotes]regexp[$pattern$\b(?i)] or [tag[DailyNotes]regexp:text[$pattern$\b(?)i] -- 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 tiddlywiki+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/6fe06f9f-3b34-43bf-bd4b-77fcc644c1f7o%40googlegroups.com.