http://franz.com/ns/allegrograph/2.2/textindex/matchExpression

Perform AllegroGraph freetext expression queries.

Like the fti:match magic property, this magic property can be used in several ways: 

?subject fti:matchExpression 'expression' .

will perform a freetext expression query for 'expression' and bind ?subject to the subject of each triple found. 

(?subject ?textObject) fti:matchExpression 'expression' .

will act as the first but will also bind ?textObject to the object of the triples found. 

?subject fti:matchExpression ( 'expression' 'indexName' ) .

and 

(?subject ?textObject) fti:matchExpression ( 'expression' 'indexName' ) .

will perform a freetext expression search using only the specified index.

You can also supply a third binding on the subject side of the magic property which will be bound to the predicate of each matching triple. For example,

(?s ?text ?predicate) fti:match 'phrase' .

will bind ?s to each matching subject, ?text to each matching object, and ?predicate to each matching predicate.

Note that fti:matchExpression expects an expression using the AllegroGraph freetext index syntax. For example 

select ?x {

   (?x ?what) fti:matchExpression '(or "springfield" "netherlands")' .

 }

would find triples whose objects contained either "springfield" or "netherlands". See fti:match if you do not need the full expression grammar for your queries.

Notes

The following namespace abbreviations are used:

The SPARQL magic properties reference has additional information on using AllegroGraph magic properties and functions.