[xwiki-users] How does one specify regular expression syntax in a Lucene search query
Hi. After much searching around the XWiki documentation, Apache Lucene documentation and googling, I have not succeeded in finding a solution to the following questions: 1. How does one locate all attachments with an extension say 'xls'? I am thinking that the query should look like "filename: *.xls", but Lucene query syntax does not allow * to be the first character of a search 2. Many times users remember some portion of the attachment filename. What would be the syntax to locate such attachments. Something like "filename: *Report*.doc" 3. The SearchApplicationLuceneSearchQueryHelp page on code.xwiki.org does not mention how to constrain a search to a given space. What is the field name for specifying a space. For example trying to locate the homepage of users with first name John by using "space:XWiki name:John*" does not work 4. Going one step further, is there a way to specify a regular expression syntax for a Lucene search query? The range operator syntax is not quite self-explanatory. For a query like "name:[Aida TO Carmen]", what does it mean to locate all pages whose name are between Aida and Carmen? Would it match AidaSummerVacation? I tried "filename:[A TO Z]*.xls" to locate an attachment name 'Test.xls' but that didn't work. If anyone can shed light on educating the finer details of using the full power of Lucene search, I would very much appreciate that. Thanks, Milind
On 01/06/2010 04:11 PM, Milind Kamble wrote:
Hi. After much searching around the XWiki documentation, Apache Lucene documentation and googling, I have not succeeded in finding a solution to the following questions: 1. How does one locate all attachments with an extension say 'xls'? I am thinking that the query should look like "filename: *.xls", but Lucene query syntax does not allow * to be the first character of a search 2. Many times users remember some portion of the attachment filename. What would be the syntax to locate such attachments. Something like "filename: *Report*.doc"
Unfortunately, as you said, Lucene doesn't allow * at the start of the word. There's nothing we can do about it, since Lucene is a standalone project, developed at the Apache Foundation. A workaround is to search using all of the letters at the start of the search term, followed by *, as in: a*.pdf OR b*.pdf OR c*.pdf OR...
3. The SearchApplicationLuceneSearchQueryHelp page on code.xwiki.org does not mention how to constrain a search to a given space. What is the field name for specifying a space. For example trying to locate the homepage of users with first name John by using "space:XWiki name:John*" does not work
The lucene plugin uses the old terminology of "web" instead of "space". So, "web:XWiki" returns all the documents in the XWiki space.
4. Going one step further, is there a way to specify a regular expression syntax for a Lucene search query? The range operator syntax is not quite self-explanatory. For a query like "name:[Aida TO Carmen]", what does it mean to locate all pages whose name are between Aida and Carmen? Would it match AidaSummerVacation? I tried "filename:[A TO Z]*.xls" to locate an attachment name 'Test.xls' but that didn't work.
Indeed, that doesn't seem to work.
If anyone can shed light on educating the finer details of using the full power of Lucene search, I would very much appreciate that.
The best documentation is on the Lucene project itself, and it seems that you've already read their query syntax page. You could ask more questions on their mailing list: http://lucene.apache.org/mail.html -- Sergiu Dumitriu http://purl.org/net/sergiu/
participants (2)
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Milind Kamble -
Sergiu Dumitriu