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From "Trejkaz (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1683) RegexQuery matches terms the input regex doesn't actually match
Date Thu, 11 Jun 2009 01:51:07 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12718270#action_12718270
] 

Trejkaz commented on LUCENE-1683:
---------------------------------

I screwed up the formatting.  Fixed version:

{code}
    @Test
    public void testNecessity() throws Exception
    {
        File dir = new File(new File(System.getProperty("java.io.tmpdir")), "index");
        IndexWriter writer = new IndexWriter(dir, new StandardAnalyzer(), true);
        Document doc = new Document();
        doc.add(new Field("field", "cat cats cathy", Field.Store.YES, Field.Index.TOKENIZED));
        writer.addDocument(doc);
        writer.close();

        IndexReader reader = IndexReader.open(dir);

        TermEnum terms = new RegexQuery(new Term("field", "cat.")).getEnum(reader);
        assertEquals("Wrong term", "cats", terms.term().text());
        assertFalse("Should have only been one term", terms.next());
    }
{code}


> RegexQuery matches terms the input regex doesn't actually match
> ---------------------------------------------------------------
>
>                 Key: LUCENE-1683
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1683
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: contrib/*
>    Affects Versions: 2.3.2
>            Reporter: Trejkaz
>
> I was writing some unit tests for our own wrapper around the Lucene regex classes, and
got tripped up by something interesting.
> The regex "cat." will match "cats" but also anything with "cat" and 1+ following letters
(e.g. "cathy", "catcher", ...)  It is as if there is an implicit .* always added to the end
of the regex.
> Here's a unit test for the behaviour I would expect myself:
>     @Test
>     public void testNecessity() throws Exception {
>         File dir = new File(new File(System.getProperty("java.io.tmpdir")), "index");
>         IndexWriter writer = new IndexWriter(dir, new StandardAnalyzer(), true);
>         try {
>             Document doc = new Document();
>             doc.add(new Field("field", "cat cats cathy", Field.Store.YES, Field.Index.TOKENIZED));
>             writer.addDocument(doc);
>         } finally {
>             writer.close();
>         }
>         IndexReader reader = IndexReader.open(dir);
>         try {
>             TermEnum terms = new RegexQuery(new Term("field", "cat.")).getEnum(reader);
>             assertEquals("Wrong term", "cats", terms.term());
>             assertFalse("Should have only been one term", terms.next());
>         } finally {
>             reader.close();
>         }
>     }
> This test fails on the term check with terms.term() equal to "cathy".
> Our workaround is to mangle the query like this:
>     String fixed = String.format("(?:%s)$", original);

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