Octavian Mocanu created LUCENE-8572:
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             Summary: 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


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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