Mailing List Archive: Can QueryParser parse regexp query?

Can QueryParser parse regexp query?

Sep 13, 2021, 10:21 AM

Post #1 of 3 (217 views)

Hi folks,
I'm currently trying to benchmark some regexp queries and found that the
default QueryParser (o.a.l.queryparser.classic.QueryParser) that luceneutil
is using is not able to parse regexps such as: "[abcde]+" or "a{1,5}".

The current workaround is to add another "if" logic in the TaskParser so
that when it sees "regexp" tag it will created a RegexpQuery without going
through QueryParser, but I still wonder whether that QueryParser is only
able to parse WildcardQuery but not RegexpQuery and do we have another
QueryParser that could parse the RegexpQuery?

Best,
Patrick

Re: Can QueryParser parse regexp query? [ In reply to ]

rcmuir at gmail

Sep 13, 2021, 10:29 AM

Post #2 of 3 (217 views)

Permalink

did you encode the query as a regexp: e.g. "/[abcde+/" or "/a{1,5}/" ?

https://lucene.apache.org/core/4_9_1/queryparser/org/apache/lucene/queryparser/classic/package-summary.html#Regexp_Searches

On Mon, Sep 13, 2021 at 1:22 PM Patrick Zhai <zhai7631@gmail.com> wrote:
>
> Hi folks,
> I'm currently trying to benchmark some regexp queries and found that the default QueryParser (o.a.l.queryparser.classic.QueryParser) that luceneutil is using is not able to parse regexps such as: "[abcde]+" or "a{1,5}".
>
> The current workaround is to add another "if" logic in the TaskParser so that when it sees "regexp" tag it will created a RegexpQuery without going through QueryParser, but I still wonder whether that QueryParser is only able to parse WildcardQuery but not RegexpQuery and do we have another QueryParser that could parse the RegexpQuery?
>
> Best,
> Patrick

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Re: Can QueryParser parse regexp query? [ In reply to ]

zhai7631 at gmail

Sep 13, 2021, 11:29 AM

Post #3 of 3 (217 views)

Permalink

Ah thank you, I didn't know that before, I just tested and it parsed!

Robert Muir <rcmuir@gmail.com> ?2021?9?13??? ??10:30???

> did you encode the query as a regexp: e.g. "/[abcde+/" or "/a{1,5}/" ?
>
>
> https://lucene.apache.org/core/4_9_1/queryparser/org/apache/lucene/queryparser/classic/package-summary.html#Regexp_Searches
>
> On Mon, Sep 13, 2021 at 1:22 PM Patrick Zhai <zhai7631@gmail.com> wrote:
> >
> > Hi folks,
> > I'm currently trying to benchmark some regexp queries and found that the
> default QueryParser (o.a.l.queryparser.classic.QueryParser) that luceneutil
> is using is not able to parse regexps such as: "[abcde]+" or "a{1,5}".
> >
> > The current workaround is to add another "if" logic in the TaskParser so
> that when it sees "regexp" tag it will created a RegexpQuery without going
> through QueryParser, but I still wonder whether that QueryParser is only
> able to parse WildcardQuery but not RegexpQuery and do we have another
> QueryParser that could parse the RegexpQuery?
> >
> > Best,
> > Patrick
>
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