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https://issues.apache.org/jira/browse/LUCENE-8572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16904395#comment-16904395
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Chongchen Chen commented on LUCENE-8572:
----------------------------------------
I find the code is relative to
[LUCENE-4199|https://issues.apache.org/jira/browse/LUCENE-4199] . Maybe we
should implement it like:
{code:java}
public static final CharSequence escapeWhiteChar(CharSequence str,
Locale locale) {
...
for (int i = 0; i < escapableWhiteChars.length; i++) {
buffer = buffer.toString().replace(escapableWhiteChars[i], "\\");
buffer =
buffer.toString().replace(escapableWhiteChars[i].toLowerCase(locale), "\\");
}
return buffer;
}
{code}
> StringIndexOutOfBoundsException in parser/EscapeQuerySyntaxImpl.java
> --------------------------------------------------------------------
>
> Key: LUCENE-8572
> URL: https://issues.apache.org/jira/browse/LUCENE-8572
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/queryparser
> Affects Versions: 6.3
> Reporter: Octavian Mocanu
> Priority: Major
>
> With "lucene-queryparser-6.3.0", specifically in
> "org/apache/lucene/queryparser/flexible/standard/parser/EscapeQuerySyntaxImpl.java"
>
> when escaping strings containing extended unicode chars, and with a locale
> distinct from that of the character set the string uses, the process fails,
> with a "java.lang.StringIndexOutOfBoundsException".
>
> The reason is that the comparison is done by previously converting all of the
> characters of the string to lower case chars, and by doing this, the original
> string size isn't anymore the same, but less, as of the transformed one, so
> that executing
>
> org/apache/lucene/queryparser/flexible/standard/parser/EscapeQuerySyntaxImpl.java:89
> fails with a java.lang.StringIndexOutOfBoundsException.
> I wonder whether the transformation to lower case is really needed when
> treating the escape chars, since by avoiding it, the error may be avoided.
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