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https://issues.apache.org/jira/browse/MNG-7052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17255109#comment-17255109
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Martin Kanters commented on MNG-7052:
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I think for some IDs that could hold, but for example for group/artifact ids it
would be cumbersome as the GAV is usually concatenated with colons already.
Underscore as first char could work, but don't think it would be confusing in
combination with operators? Like for example "--pl -_artifact", people could
think it's some magic syntax.
> Do not allow symbols as first character of identifiers in the POM
> -----------------------------------------------------------------
>
> Key: MNG-7052
> URL: https://issues.apache.org/jira/browse/MNG-7052
> Project: Maven
> Issue Type: Improvement
> Components: core
> Reporter: Martin Kanters
> Priority: Major
> Labels: up-for-grabs
> Fix For: 4.0.x-candidate
>
>
> In the {{DefaultModelValidator}} we currently validate identifiers against
> {{a-zA-Z0-9-_.}}
> Since Maven also allows operators to be used against an identifier, this can
> result in bugs or at least unexpected behavior for the user.
> The minus operator can be used to deactivate a certain profile, so an example
> would be:
> - A project having a profile with the id {{-id-of-profile}}
> - A Maven invocation of {{mvn <goal> -P-id-of-profile}}.
> The release of Maven 4 is a nice opportunity to restrict the first character
> of an id to be {{a-zA-Z0-9}} . The other characters may still consist of
> those symbols.
> This should apply to all identifiers that we support. The methods that need
> attention are:
> {{DefaultModelValidator#validateId}} and
> {{DefaultModelValidator#validateIdWithWildcards}}.
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