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https://issues.apache.org/jira/browse/SOLR-8725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15160352#comment-15160352
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Jan Høydahl commented on SOLR-8725:
-----------------------------------

It makes sense to allow hyphens, but not as first character of the name. In 
SOLR-8110 we discuss rules for all kind of identifiers for 6.x and so far there 
seems to be consensus to allow both hyphens, dots and underscores.

> Invalid name error with core names with hyphens
> -----------------------------------------------
>
>                 Key: SOLR-8725
>                 URL: https://issues.apache.org/jira/browse/SOLR-8725
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 5.5
>            Reporter: Chris Beer
>
> In SOLR-8642, hyphens are no longer considered valid identifiers for cores 
> (and collections?). Our solr instance was successfully using hyphens in our 
> core names, and our affected cores now error with:
> marc-profiler_shard1_replica1: 
> org.apache.solr.common.SolrException:org.apache.solr.common.SolrException: 
> Invalid name: 'marc-profiler_shard1_replica1' Identifiers must consist 
> entirely of periods, underscores and alphanumerics
> Before starting to rename all of our collections, I wonder if this decision 
> could be revisited to be backwards compatible with previously created 
> collections.



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