Backward compatibility error in PythonIdentifier validation regex

[zopyx]

See

https://community.plone.org/t/transmogrifier-transmogrifier-registerconfig-with-dotted-name-as-name-parameter/8522

Short version: PythonIdentifier().validate("foo.bar") pass validation in former zope.configuration versions but no longer in the latest release.

[jamadden]

Yes, that's deliberate (#29). DottedName would be the field to use if you want to allow dots.