> I try to create a list (in a tiddler) which is filtered by tags.
> Finally the list should contain all existing tiddlers exclude tiddler
> by one or more defined tags.
>
> For example:
> <<list filter [tag[ALL]] [!tag[systemConfig]] [!tag[[admin]]>>

Try this plugin:
   http://www.TiddlyTools.com/#MatchTagsPlugin

It extends the core's filterTiddlers() function so you can create
complex tag matching criteria using *boolean operators* ('and', 'or',
'not', plus nested parentheses if needed) as well as *regular
expressions* (to match 'wildcard' or other patterned tag values).

Using your example from above, you could write:

<<list filter [tag[not(systemConfig or admin)]]>>

Note: for shorter notation, you can use "&&" for AND, "||" for OR and
"!" for NOT, like this:

<<list filter [tag[!(systemConfig||admin)]]>>

enjoy,
-e
Eric Shulman
TiddlyTools / ELS Design Studios
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