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).

NOTE: To use the MATCHCOVER field specifier against fields that were added using the DREREPLACE index action, you must define the fields as MatchType.

To use the MATCHCOVER field specifier for fields that contain multiple identical values that might match, you must define the fields as CountType.

Format

FieldText=MATCHCOVER{yourStrings}:yourField
yourStrings

One or more strings. A document is returned 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 below) or consist of several words.

NOTE: Strings in the query should be percent-encoded. This ensures that any commas or curly braces that are part of a string are not interpreted as query syntax. If you are sending HTTP requests using the content-type application/x-www-form-urlencoded you should 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.)