Re: Rule to detect non-standard headers that aren't X- prefixed

[Philip Prindeville]

> On May 11, 2022, at 1:44 AM, Henrik K <h...@hege.li> wrote:
> 
> On Tue, May 10, 2022 at 06:19:38PM -0600, Philip Prindeville wrote:
>> See my original message.
>> 
>> I can't think of a single way to match each header, and then test for any of 
>> them not matching the pattern...
> 
> Simply use regex negative lookahead.
> 
> ALL =~ /^(?!Foo|Bar):/m
> 
> It will hit any line _not_ starting with Foo: or Bar:
> 


Ah, that did it.

Of course, if I get false positives, I'll have to search for the header names I 
forgot to include manually...