Dumping it into a file would take something else (although you can export tiddlers in various formats so that may help), but to get the raw text you can use the text widget like this probably overly complex example:
<$list filter="[tag[testcase]]"> !!The tiddler tiddler <$view field='title'/> has the text --- <pre> <$text text={{!!text}}/> </pre> --- which is is rendered as --- <$transclude mode=block/> --- </$list> -- 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 post to this group, send email to tiddlywiki@googlegroups.com. 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/0b35c9aa-f253-4d44-a246-28196e7ab749%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.