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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 and property types. The field specifier is optimized only if you specify both property types. If you configure the field with only the property, queries might not return the expected results.

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

## 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 25.4 | Last updated October 2025

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Product: Knowledge Discovery Proxy Component 25.4

Topic Title: MATCHCOVER