| purpose | filter the input by pattern-matched field |
|---|---|
| input | a selection of titles |
| suffix | F=the name of a field, defaulting to title |
| parameter | X=a regular expression |
| output | those input tiddlers in which field F matches X |
! output | those input tiddlers in which field F does not match X |
Learn more about how to use Filters
Regular expressions are concise strings of characters that denote patterns of text to search for. The format used in TiddlyWiki is fully defined in this Mozilla reference.
The filter syntax makes it impossible to directly specify a regular expression that contains square brackets. The solution is to store the expression in a variable. See the examples.
The parameter X can optionally start or end with a string of flags:
Only the i flag is generally useful: it forces the different between capital and lowercase letters to be ignored.
If X is empty, regexp will match all of the input tiddlers.