For example end users enter 'Java-test' as the input for search.
The Lucene API user would have to escape the '-'
Else you get the following exception
<exception>
org.apache.lucene.queryParser.ParseException: Encountered
"<EOF>" at line 1, column 8.
Was expecting one of:
"(" ...
<QUOTED> ...
<TERM> ...
<PREFIXTERM> ...
<WILDTERM> ...
<RANGEIN> ...
<RANGEEX> ...
<NUMBER> ...
at
org.apache.lucene.queryParser.QueryParser.generateParseException(Unkno
wn Source)
at
org.apache.lucene.queryParser.QueryParser.jj_consume_token(Unknown
Source)
at org.apache.lucene.queryParser.QueryParser.Clause(Unknown
Source)
at
org.apache.lucene.queryParser.QueryParser.Query(Unknown Source)
at org.apache.lucene.queryParser.QueryParser.parse(Unknown
Source)
at org.apache.lucene.queryParser.QueryParser.parse(Unknown
Source)
at
<exception>
To avoid this I escape the input by using this method.
<method>
public static escape(String query){
String[] reservedChars = new String[]{"AND", "OR", "NOT", "+",
"-", "||", "&&",
"!", "(", ")", "{", "}",
"^", "~", "*", "?", ":", "\\" };
for (int i = 0 ,j = reservedChars.length; i < j; i++) {
if (query.indexOf(reservedChars[i]) >= 0) {
final String reservedChar = reservedChars[i];
final String s = String.valueOf('\\') + reservedChar ;
query = StringUtils.replace(query, reservedChar, s);
}
}
// query = StringUtils.lowerCase(query);
return query
}
</method>
Was this a good idea? If so would it be helpful to others?
--- Anand Stephen
-----Original Message-----
From: Erik Hatcher [mailto:[EMAIL PROTECTED]
Sent: Sunday, February 15, 2004 4:11 AM
To: Lucene Developers List
Subject: Re: Escaping lucene key words.
On Feb 14, 2004, at 10:55 PM, Anand Stephen wrote:
> (i) Is there an utility method to escape all Lucene keywords.
> Something along the lines of this method
>
> http://jakarta.apache.org/commons/lang/api/org/apache/commons/lang/
> StringEscapeUtils.html#escapeXml(java.lang.String)
>
> (ii) If the answer to (i) is yes where can I find it?
>
> (iii) If the answer to (i) is no.
> Would it be a good idea to provide Lucene user with a additional
> utility class(es) in the "util" package that does work some work
> like escape chars and any other methods that would make the Lucene
> user's life even more easier?
> I am willing to contribute code for this method.
Stephen - where are you feeling the need to have this type of escaping
with Lucene? Could you show us where there is a problem?
Erik
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