AttributeError caused by author field, breaking `poetry build`

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

Issue

poetry build -f sdist

With author field in pyproject.toml

authors = ["R&D <[e-mail]>"]

Output:

[AttributeError]               
'NoneType' object has no attribute 'group'  

Perhaps this is for a good reason, but it confused me for a long while because I didn’t know this meant something was wrong in my pyproject.toml file. It would be useful to have indications of toml validation problems by field.

Changed to:

authors = ["Research Development <[e-mail]>"]

Works, and that is fine. Just didn’t know there were validation rules for these strings.

[kam1sh]

@nackjicholson What do you think, maybe replacing 'NoneType' object has no attribute 'group' to Invalid project's author: "author ([e-mail])" would be enough?

[kam1sh]

Faced this problem today, on version 0.12.11 (Python 3.7.2). Had this field in pyproject.toml:
authors = ["[e-mail]]

Changed to authors = ["Example support <[e-mail]>"], works fine.

I’ll try to fix this on this or next weekend, because it looks like obvious regex mismatch.