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Using filters to select further

The &filter parameter filters out documents that match certain criteria. That is, documents that match are excluded from the output list. Sometimes you want to filter items in. This is possible using a "double negative" - excluding items that don't match a "not equals" condition.

A filter has three elements, separated by commas (and no extra spaces): field,criterion,mode. field can be any document field or template variable;

criterion is data of the same type (string, number etc.) as the field;

mode is one of:

Mode	Comparison: exclude document if field:
1	is not equal to the criterion (!=)
2	is equal to the criterion (==)
3	is less than the criterion (<)
4	is greater than the criterion (>)
5	is less than or equal to the criterion (<=)
6	is greater than or equal to the criterion (>=)
7	does not contain the text of the criterion
8	contains the text of the criterion
9	case insensitive version of #7
10	case insensitive version of #8
11	checks leading character of the field (??? TBD)

This example selects all the documents with the string "tacit" in the page title (by excluding those that don't contain it; case-insensitive comparison):

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Multiple filters can be used, separated by the "|" pipe symbol. Documents that match any of the filters will be excluded. This example selects the range of documents 170-173 by ID:

Articles

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