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implies that for an advanced search system that most websites provide, a hybrid approach would be used.
We??™ll explore that a little later. Let??™s look first at the query parser for strings.
String queries
All search engines provide a very simple search interface for their users: a single text field. This makes it
very easy to use, but at first glance seems to make it harder to provide a complex query. Like Google,
Zend_Search_Lucene has a query parser that can interpret what is typed into a single text field into a powerful
query. When you pass in a string to the find() function, behind the scenes the function
Zend_Search_Lucene_Search_QueryParser::parse() is called. This class implements the Lucene query parser
syntax as supported by v 2.0 of Apache Lucene.
To do its work, the parser breaks down the query into terms, phrases and operators. A term is a single
word and a query is multiple words grouped using quotation marks, such as ???hello world???. An operator is a
boolean word (such as AND) or symbol modified used to provide more complex queries. Wildcards are also
supported using the asterisk and question mark symbols. A question mark is used to represent a single
character and the asterisk represents several characters. For instance searching for frame* will find frame,
framework, frameset and so on.
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