Query Language

Terrier offers a flexible and powerful query language for searching with phrases, fields, or specifying that terms are required to appear in the retrieved documents. Some examples of queries are the following:

Combinations of the different constructs are possible as well. For example, the query term1 term2 -term1 term2 would retrieve all the documents that contain at least one of the terms term1 and term2, but not the documents where the phrase “term1 term2” appears.

Note that in some configurations, the Terrier query language may not be available by default. In particular, if batch processing queries from a file using a class that extends TRECQuery, then the queries are pre-processed by a tokeniser that may remove the query language characters (e.g. brackets and colons). To use the Terrier query language in this case, you should use SingleLineTRECQuery and set SingleLineTRECQuery.tokenise to false in the terrier.properties file.

Webpage: http://terrier.org
Contact: School of Computing Science
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