Email regex does not allow apostrophes #6
Description
Values in the Email widget that have apostrophes are incorrectly marked as invalid because of this regex https://github.com/plone/plone.schema/blob/master/plone/schema/email.py#L10. CMFPlone already has a robust email regex https://github.com/plone/Products.CMFPlone/blob/master/Products/CMFPlone/PloneTool.py#L69 that is used for registration, etc. I think plone.schema should either import that, or copy/paste the same thing for its own use.