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https://issues.apache.org/jira/browse/COUCHDB-573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12780927#action_12780927
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Brian Candler commented on COUCHDB-573:
---------------------------------------
There is no $0 in Javascript, but $& gives the whole substring which matches
the regexp. You can try it out using 'js' at the command line (under Ubuntu:
install the 'spidermonkey-bin' package)
js> 'TestTwo'.replace(/[A-Z]/g, ' $&')
Test Two
Incidentally, Ruby is the same. $0 is the name of the running script and is
nothing to do with regexp captures.
~$ irb --simple-prompt
>> $0
=> "irb"
>> "TestTwo".gsub!(/[A-Z]/) { " #{$&}" }
=> " Test Two"
>>
> Regex capture problem in emit functions
> ---------------------------------------
>
> Key: COUCHDB-573
> URL: https://issues.apache.org/jira/browse/COUCHDB-573
> Project: CouchDB
> Issue Type: Bug
> Affects Versions: 0.11
> Environment: Linux
> Reporter: Eric Desgranges
> Priority: Trivial
> Fix For: 0.11
>
>
> The capture variables $0, $1, $2... don't get instantiated in regex
> expressions placed in emit functions.
> Example:
> function(doc) { if (doc.EntityType != null) { emit(doc.ID.Value + '.' +
> doc.EntityType, { Type: doc.EntityType.replace(/[A-Z]/g, ' $0'), ....
> EntityType: TestTwo
> Returns:
> Type: " $0est $0wo"
> Instead of:
> Type: " Test Two"
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