Re: C library for parsing email addresses

In reply to trentbuck@gmail.com (Trent W. Buck):

Graeme Cross <gcross@fastmail.fm> writes: ... I do not believe that is possible. AFAICT, this ABNF snippet from RFC 5322 (p12) is irregular:

My formal-language theory is a bit rusty, but, indeed, you can't recognize context-free languages (having nesting), using regular expressions (even extended with backreferences, as they usually are in practice). -- Smiles, Les.