bug#51733: 27.1; Detect impossible email addresses better

[Lars Ingebrigtsen]

Next stupid question:

---
It must not contain any stateful bidirectional format characters.

    That is, no [:bidicontrol:] except for the LRM, RLM, and ALM, since the 
bidirectional controls could influence the ordering of characters outside the 
quotes.
---

We don't have the :bidicontrol: regexp class.  Do we have another way to
classify bidi control characters?  The have class Cf, but so does many
other non-bidi control characters...

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   bloggy blog: http://lars.ingebrigtsen.no