> * does not support and filtering
> * does not support fields
> I was determined to use a syntax such as [tag[tag1]tag[tag2]]

http://www.TiddlyTools.com/#MatchTagsPlugin

provides a robust tag filtering syntax using full Boolean-logic (AND,
OR, NOT, plus nested parentheses as needed).  You can also use regular
expressions to match *patterned* tags (e.g., use "foo.*" to match any
tag starting with "foo").

Also, to sort the results by *any* tiddler field, you can use the TW
*core* syntax:
   [sort[fieldname]] (ascending)
or
   [sort[-fieldname]] (descending)

note: although custom fields are entered and stored as text strings,
if the field values are numeric digits, then sorting *will* be
performed numerically (e.g., "1", "2", "3"..."10","11", etc.) rather
than by text comparison (e.g. "1", "10", "11", "2", "3", etc.)

Thus:

[tag[(foo OR bar) AND NOT (mumble AND gronk OR snork)]][sort[-
priority]]

enjoy,
-e
Eric Shulman
TiddlyTools / ELS Design Studios

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