Lucene search and underscores

Posted by Matt on Stack Overflow See other posts from Stack Overflow or by Matt
Published on 2010-03-26T00:44:24Z Indexed on 2010/03/29 17:23 UTC
Read the original article Hit count: 659

Filed under:

lucene

|

underscore

|

lucene.net

When I use Luke to search my Lucene index using a standard analyzer, I can see the field I am searchng for contains values of the form MY_VALUE. When I search for field:"MY_VALUE" however, the query is parsed as field:"my value"

Is there a simple way to escape the underscore (_) character so that it will search for it?

© Stack Overflow or respective owner

Related posts about lucene

performance comparision between Zend Lucene and Java Lucene

as seen on Stack Overflow - Search for 'Stack Overflow'
Zend Lucene and Java Lucene are built in PHP and java repectively, and PHP language has a higher level than java. Just wondering How big the performance difference among these two, regarding to index building and data searching? Is it much more effective to let java create and rebuild index, and… >>> More
Why wasn't fast-vector-highlighter (lucene-contrib) made an official part of Lucene 3.0 core

as seen on Stack Overflow - Search for 'Stack Overflow'
I've read some Jira entries and they mentioned moving fast-vector-highlighter to core about a year ago but it never made it. Looking at the svn for contrib it seems incomplete. There are no tests for FastVectorHighlighter Documentation is lacking No samples anywhere on apache.org Anyone have… >>> More
pylucene: install error

as seen on Stack Overflow - Search for 'Stack Overflow'
I am trying to install Pylucene (pylucene-3.3-3-src.tar.gz) on my ubuntu linux 11.10. I have python 2.7.2. I was able to compile JCC (I think) because I didnt see any error when I installed it. When I tried to install Pylucene I get the following error. Can someone help? Thanks. ICU not installed /usr/bin/python… >>> More
Solr WordDelimiterFilter + Lucene Highlighter

as seen on Stack Overflow - Search for 'Stack Overflow'
I am trying to get the Highlighter class from Lucene to work properly with tokens coming from Solr's WordDelimiterFilter. It works 90% of the time, but if the matching text contains a ',' such as "1,500" the output is incorrect: Expected: 'test 1,500 this' Observed: 'test 11,500 this' I… >>> More
java AbstractMethodError

as seen on Stack Overflow - Search for 'Stack Overflow'
How to handle this error in lucene: java.lang.AbstractMethodError: org.apache.lucene.store.Directory.listAll()[Ljava/lang/String; at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:568) at org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:69) … >>> More

Related posts about underscore

Disable WPF label accelerator key (text underscore is missing)

as seen on Stack Overflow - Search for 'Stack Overflow'
I am setting the .Content value of a Label to a string that contains underscores; the first underscore is being interpreted as an accelerator key. Without changing the underlying string (by replacing all _ with __), is there a way to disable the accelerator for Labels? >>> More
C# - Replace Every UpperCase Letter with Underscore and the Letter

as seen on Stack Overflow - Search for 'Stack Overflow'
How do replace Every UpperCase Letter with Underscore and the Letter in C#? note: unless the character is already proceeded by a underscore. Is Regex the best approach? Where do I start with this one? >>> More
Underscore before theme name

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi There, I was browsing the template.php file for the rootcandy theme and noticed some of the function names start with an underscore i.e. function _rootcandy_admin_links() function rootcandy_body_class() Anyone know why this is? I thought the functions had to start with the name of the theme… >>> More
Replace underscore between words (reg.exp)

as seen on Stack Overflow - Search for 'Stack Overflow'
Hey, I need a regular expression to solve the following problem (links to similar problems is also appreciated, related tutorials etc.): __some_words_a_b___ => __some words a b___ ____ => ____ So I want underscores between words to be replaced with space and keep leading and trailing underscores… >>> More
Poll - to use underscore with private fields or not to

as seen on Stack Overflow - Search for 'Stack Overflow'
I wanted to get a tally (so I can in the end just see how many people if any don't use _ in field names) of who uses _ and who does not on private field names. >>> More