In reading the documentation for escape characters, I'm having a little trouble understanding what it wants me to do for certain special cases.
http://lucene.apache.org/java/docs/queryparsersyntax.html#Escaping%20Special%20Characters says: "Lucene supports escaping special characters that are part of the query syntax. The current list special characters are: + - && || ! ( ) { } [ ] ^ " ~ * ? : \ To escape these character use the \ before the character." Specifically, I'm curious about the double characters && and || and how they should be properly escaped. Experimentation showed some very strange things with the StandardAnalyzer. Using Luke, I get some interesting mappings. AT&T becomes at&t (as expected) AT&&T becomes t (tricky... at is now taken as a stop word; fine makes sense) ..but what about... "AT&&T" ...nope, still t. AAA&BBB becomes aaa&bbb ...correct AAA&&BBB becomes aaa bbb ...ampersand becomes a space? "AAA&&BBB" is also aaa bbb AAA\&BBB correctly is aaa&bbb ...just as before AAA\&&BBB is aaa bbb ...but perhaps we got the escape wrong. Is '&&' special "character" and is it escaped as \&& or escaped as \&\& ...let's find out. AAA\&\&BBB is also aaa bbb ...perhaps we need quotes? "AAA\&\&BBB" is also aaa bbb ...I can't seem to get the escape to work. How about this? AAA&BBB&CCC strangely becomes aaa&bbb ccc Even when escaped? AAA\&BBB\&CCC is also aaa&bbb ccc ...appears so. What about... AAA&BBB&CCC&DDD becomes aaa&bbb ccc&ddd ....whoa, not expecting that. AAA&&BBB&&CCC&&DDD becomes aaa bbb ccc ddd ...if && means AND, ok... AAA\&&BBB\&&CCC\&&DDD no change aaa bbb ccc ddd AAA\&\&BBB\&\&CCC\&\&DDD also no change aaa bbb ccc ddd It appears I literally cannot search for the token with two ampersands in it, whether they are touching or not. Clearly I'm missing something. Is there a way to get any literal sequence of my choosing, using escapes, as a term in the Lucene expression? -Walt Stoneburner --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
