Re: [RFC] Quoting property names in tag/property matches [Was: [BUG?] Matching tags: & operator no more implicit between tags and special property]

[Jens Schmidt]

On 2023-08-24  09:32, Ihor Radchenko wrote:
> Jens Schmidt <jschmidt4gnu@vodafonemail.de> writes:

>> Some obvious choice would be a simpler single backslash
>>
>>   (B) "\-" => "-"
> 
> I prefer (B). And we will need to allow escaping of the "\" itself. Like
> \\.

OK.  Since backslash is not used yet in the rest of the regexp, (B)
should be rather edge-case-free.  So the corresponding subre to match
property names would look like

  \(?5:\(?:[[:alnum:]]+\|\\[^[:space:]]\)+\)

IOW, backslash quotes everything except whitespace, which by definition
cannot be part of a property name.

Will start on this, but with tests and documentation this might take
some time.