You can modify query terms to provide a wide range of search
options.
The following term modifiers are supported:
- Wildcard searches
- Lucene supports single- and multiple-character wildcard searches
within single terms. Use the question mark (?) for
a single-character wildcard search and an asterisk (*)
for a multiple-character wildcard search. Multiple-character wildcard
searches look for zero or more characters.
Attention: The
wildcard characters ? or * cannot
be used as the first character of a search.
- Examples:
- Search for the words test or text:
te?t
- Search for test, tests, or tester:
test*
- Fuzzy searches
- A fuzzy search is a type of search that finds matches even if
search terms are misspelled or only partial words are specified. To
do a fuzzy search, use the tilde (~) symbol at the
end of a term.
- Example:
- Search for a term similar in spelling to word:
word~
This
search term will match wood, work, dword, wordy, ford,
and so on, as well as word.
- Proximity searches
- Lucene supports finding words that are within a short distance
of one another in a record field. To perform a proximity search, use
the tilde (~) symbol followed by a number at the
end of a phrase.
- Example:
- Search for and Beta2 within
ten words of one another in a record field:
"Beta1 Beta2"~10
- Range searches
- Range searches allow you to match records that contain field values
between the lower and upper bounds specified by the query. Range queries
can be inclusive or exclusive.
Inclusive-range queries are denoted
by square brackets and the operator
TO:
[LowerBound TO UpperBound]
Exclusive-range
queries are denoted by curly brackets and the operator
TO:
{LowerBound TO UpperBound}
Range
queries are not reserved for numeric fields. You can also perform
a range search on fields with alphabetic values. Sorting is performed
lexicographically. As such, records returned by a range-search query
do not have a relevance score.
- Examples:
- Find records with SubmitDate field values
between 2007 and 2008, inclusive:
SubmitDate:[2007 TO 2008]
- Narrow your search to the month of October 2007:
SubmitDate:[20071001 TO 20071031]
- Find records with SubmitDate field values
that range from 01 October 2008 through the newest record in the user
database, inclusive:
SubmitDate:[20081001 TO *]
- Find records with Headline values that
range between alpha and delta, including alpha and
excluding delta:
Headline:[alpha TO delta}
Your
result set might include records with headlines that start with alpha, alpha1, beta, beta1,
and beta2.
- Boosting a term
- Lucene provides a relevance score for matching records that is
calculated by the configured analyzers. To boost the weight of a term
or phrase in a query, use a caret (^) symbol and
a boost factor (a number) following the term or phrase. The higher
the boost factor, the more relevant the term or phrase is.
The default
boost factor is 1. Although the boost factor must be a positive number,
it can be less than 1, for example, 0.2, to lower the relevance of
records that contain the term or phrase.
- Examples:
-