Category Component 25.3
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# MATCHCOVER

The `MATCHCOVER` field specifier (case sensitive) allows you to find documents in which the values in all instances of a specified field have matches in the set of string values provided in the specifier. In other words, the specifier must cover all instances of the field. A search using `MATCHCOVER` is slower than one using MATCH.

To match numeric values, use EQUALCOVER.

NOTE: You can optimize the field specifier speed by configuring the field with the `MatchType` and `CountType` property types. The field specifier is optimized only if you specify both property types. If you configure the field with only the `MatchType` property, queries might not return the expected results.

NOTE: To use the `MATCHCOVER` field specifier against fields that were added using the `DREREPLACE` index action, or fields that contain multiple identical values that might match, you must define the fields as `MatchType` and `CountType`.

## Format

    FieldText=MATCHCOVER{yourStrings}:yourField

`yourStrings` | One or more strings. A document returns only if the value in each of its instances of `yourField` matches one of the strings in `yourStrings`. The matching is case-independent. You can match strings that contain punctuation (but see Note) or consist of several words. NOTE: Strings in the query must be percent-encoded to ensure that any commas or curly braces that are part of a string are not interpreted as query syntax. If you send HTTP requests using the content-type `application/x-www-form-urlencoded` you must then percent-encode all parameter values, meaning that any commas or curly braces that are part of a string are percent-encoded twice (such that a comma is represented by the sequence `%252c`). For more information, see Percent Encoding in Queries.
`yourField` | The name of the field to match against. A document returns only if: it contains one or more instances of the field and the value of each instance is found in `yourStrings`, or it does not contain the field at all.

## Example

    FieldText=MATCHCOVER{Confidential,Secret,TopSecret,FBI}:SECURITYLEVEL

For a document to return as a result, its `SECURITYLEVEL` fields must have no values that are not in the specified list. For example, if a document includes a `SECURITYLEVEL` field with the value `MI5`, it does not return.

(If a document has no `SECURITYLEVEL` field at all, it returns.)

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Version 25.3 | Last updated July 2025

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Product: Knowledge Discovery Category Component 25.3

Topic Title: MATCHCOVER