Hi Jeremy

I think your example is equivalent to:
>
> [tag[sample_tag]] -[tags[]tag[sample_tag]]
>

You are right. Thanks for this. 
I could not figure out how to simplify that expression. I got some list and 
look what the filter can help extract tags. First i need to select the tags 
and then apply my filter to get final list.

That could still be optimised into a single filter operator, but the 
> question is whether that's worth doing in the core.
>
 
Tiddlywiki does not have filter operator which could get tags (or tiddlers 
not used as tags) from the current list. [tags[]] returns all the tags 
present on the tiddlers in the current list.
In my opinion, new filter operator [notag[]] or may be [istag[]] will 
simplify filter expressions. It will make them more understandable.

Sorry for my English again. Hope you can understand me.
Best regards.

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