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Re: [Idna-update] IDNA and combining sequences (was: Re: Expiration impending: <draft-klensin-idna-rfc5891bis-01.txt>)

"John R Levine" <johnl@taugh.com> Thu, 15 March 2018 21:30 UTC

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Date: 15 Mar 2018 17:30:12 -0400
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From: "John R Levine" <johnl@taugh.com>
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Subject: Re: [Idna-update] IDNA and combining sequences (was: Re: Expiration impending: <draft-klensin-idna-rfc5891bis-01.txt>)
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> Now, given that an XML per RFC 7940 is fully machine parsable, it could be an 
> exercise to the reader to compile a regex for full labels. I think that 
> should be possible, however, I've not attempted to prove this - there may be 
> some syntax construction that is difficult/impossible to translate into a 
> regex for the whole label.

Interesting point, I'll take a look.

I'm not surprised that other people are less thrilled by regexes than I 
am, since the probably weren't teaching compiler courses and drawing state 
machines on the chalkboard 40 years ago.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly

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