I'm just reading the code:
case WILDCARD_ESCAPE:
// add the next codepoint instead, if it exists
if (i + length < wildcardText.length()) {
final int nextChar = wildcardText.codePointAt(i + length);
length += Character.charCount(nextChar);
automata.add(BasicAutomata.makeChar(nextChar));
break;
} // else fallthru, lenient parsing with a trailing \
So, if the user places a backslash before a non-wild character, the
backslash will be discarded. For example:
abc\\def-x*y
As is, the code will remove that first backslash and include the next
character from the pattern string, which happens to be a backslash as well.
If the user merely wrote:
abc\def-x*y
As is, the code will remove the backslash and merely accept the next
character.
So, if the user wants a backslash in their wildcard term, it does need to be
escaped. I think. If I am wrong, please explain further.
-- Jack Krupansky
-----Original Message-----
From: Robert Muir
Sent: Thursday, September 13, 2012 3:01 PM
To: [email protected]
Subject: Re: svn commit: r1384427 -
/lucene/dev/trunk/lucene/core/src/java/org/apache/lucene/search/WildcardQuery.java
But thats not true.
On Thu, Sep 13, 2012 at 2:52 PM, Jack Krupansky <[email protected]>
wrote:
Technically, should also indicate that backslashes need to be escaped to
include them in a wildcard term.
-- Jack Krupansky
-----Original Message----- From: [email protected]
Sent: Thursday, September 13, 2012 1:42 PM
To: [email protected]
Subject: svn commit: r1384427 -
/lucene/dev/trunk/lucene/core/src/java/org/apache/lucene/search/WildcardQuery.java
Author: rmuir
Date: Thu Sep 13 17:42:18 2012
New Revision: 1384427
URL: http://svn.apache.org/viewvc?rev=1384427&view=rev
Log:
add note about escaping terms
Modified:
lucene/dev/trunk/lucene/core/src/java/org/apache/lucene/search/WildcardQuery.java
Modified:
lucene/dev/trunk/lucene/core/src/java/org/apache/lucene/search/WildcardQuery.java
URL:
http://svn.apache.org/viewvc/lucene/dev/trunk/lucene/core/src/java/org/apache/lucene/search/WildcardQuery.java?rev=1384427&r1=1384426&r2=1384427&view=diff
==============================================================================
---
lucene/dev/trunk/lucene/core/src/java/org/apache/lucene/search/WildcardQuery.java
(original)
+++
lucene/dev/trunk/lucene/core/src/java/org/apache/lucene/search/WildcardQuery.java
Thu Sep 13 17:42:18 2012
@@ -28,7 +28,10 @@ import java.util.List;
/** Implements the wildcard search query. Supported wildcards are
<code>*</code>, which
* matches any character sequence (including the empty one), and
<code>?</code>,
- * which matches any single character. Note this query can be slow, as it
+ * which matches any single character. If you want to treat a wildcard as
a
literal
+ * character instead, escape it with '\'.
+ * <p>
+ * Note this query can be slow, as it
* needs to iterate over many terms. In order to prevent extremely slow
WildcardQueries,
* a Wildcard term should not start with the wildcard <code>*</code>
*
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