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https://issues.apache.org/jira/browse/LUCENE-1122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12646275#action_12646275
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Mark Miller commented on LUCENE-1122:
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Its because a term is madeup of TERM_START_CHAR + TERM_CHAR*, both of which can
contain an ESCAPED_CHAR, which is an escape, '\', followed by anything. So
backslash space matches ESCAPED_CHAR, and the space is eaten as part of the
term rather than being used as a whitespace break.
We could change it, or it sounds like its fine to leave it. If we leave it, I
guess we can doc it and close this issue. Give me your preference and I'll be
happy to do it.
> queryparser whitespace escaping and documentation?
> --------------------------------------------------
>
> Key: LUCENE-1122
> URL: https://issues.apache.org/jira/browse/LUCENE-1122
> Project: Lucene - Java
> Issue Type: Improvement
> Components: QueryParser, Website
> Reporter: Hoss Man
>
> as noted in this solr thread...
> http://www.nabble.com/PhraseQuery-and-WildcardQuery-to14503609.html#a14503609
> ...it's possible to escape a whitespace character in the value of a term or
> prefix query by using a backslash so that the QueryParser will not treat it
> as "special" (ie: won't split on it when dividing the input into chunks for
> analysis).
> at a minimum, this should be noted here...
> http://lucene.apache.org/java/docs/queryparsersyntax.html#Escaping%20Special%20Characters
> ...but it got me wondering...
> * is this a side effect of something else, or will QueryParser really
> respect this everywhere? even in field names? (i haven't tested) ... i think
> this is a result of QueryParser allowing you to escape any character even if
> it isn't "special" to the syntax
> * shouldn't a space be considered "special" since it does trigger certain
> behavior? ... so shouldn't QueryParser.escape(String) escape spaces as well
> as the other special characters?
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