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# STRING

The `STRING` field specifier (case sensitive) allows you to specify one or more strings of which one must be contained as a substring in a specified field.

Note: The field specifier speed can be optimized by restricting the field to the MatchType property type.

## Format

    FieldText=STRING{yourStrings}:yourFields

`yourStrings` | Type one or more strings. A document is only returned if one of these strings is a substring of the value in one of `yourFields`. You can match strings that contain punctuation (but see Note below) or consist of several words. Note: To distinguish query syntax punctuation from punctuation within strings, double-percent-encode commas and curly braces within strings. Query syntax punctuation must be left unencoded. There must be no space before or after a separator comma.
`yourFields` | Type one or more fields. A document is only returned if it contains one of these fields, and if the value in this field is contains one of `yourStrings` as a substring.Separate multiple fields with colons (`:`). There must be no space before or after a colon.

## Example

    FieldText=STRING{cat,dog}:ANIMAL

A document's `ANIMAL` field value must contain the substring `cat` or `dog` for this document to be returned.

    FieldText=STRING{old cat}:ANIMAL:TOPIC

A document's `ANIMAL` or `TOPIC` field value must contain the substring old cat for this document to be returned. If a document's `ANIMAL` field, for example, has the value `old cat`, `old caterpillar` or `bold cats`, this document is returned.

    FieldText=STRING{example.com}:COMPANY

A document's `COMPANY` field value must contain the substring example.com for this document to be returned. If a document's `COMPANY` field, for example, has the value `example.com` or `http://www.example.com/content/home`, this document is returned.

    FieldText=STRING{a%2Cb}:MISC

A document's `MISC` field value must contain the substring `a,b` for this document to be returned. If a document's `MISC` field, for example, has the value `a,b` or `a,b,c,` this document is returned.

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