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https://issues.apache.org/jira/browse/LUCENE-5754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14030058#comment-14030058
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Ryan Ernst commented on LUCENE-5754:
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+1
> Allow "$" in expression variables
> ---------------------------------
>
> Key: LUCENE-5754
> URL: https://issues.apache.org/jira/browse/LUCENE-5754
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/expressions
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Attachments: LUCENE-5754.patch
>
>
> The current expressions modules only allows ASCII letters, ASCII digits and
> the underscore in variable names.
> It is quite common to javascript developers to use also the dollar sign as
> identifier part (especially at the beginning of an identifier, see the famous
> "jQuery" $-function). This would allow bindings like "$score".
> The official ECMAScript spec allows the $:
> http://www.ecma-international.org/publications/files/ECMA-ST-ARCH/ECMA-262,%203rd%20edition,%20December%201999.pdf
> (see section 7.6)
> The other stuff there like unicode escapes and all unicode letter crazyness
> should be excluded for simplicity.
> Adding the "$" is just a one-line change in the grammar and does not conflict
> with anything else, because "$" is not a special character to javascript.
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