special characters like brackets as tag values

[h4de5]

I am trying to put more flexibility into home-assistant and rhasspy. one part of this is to define more complex rules and parameters:

[FetchUrl]
how is the weather [today|outside] (:){url:https://www.zamg.ac.at/cms/de/wetter/wetter-oesterreich} (:){xpath://*[@id="prognosenText"]/p/text()}

above is just one example - here I send an url and path within the content of that website, to be retrieved by a script in home-assistant.

I can't find a way to set the tag xpath to include characters like: ()[]=

i assume it breaks while during parsing:

rhasspy-nlu/rhasspynlu/jsgf.py

Line 407 in d423da5

"No group preceeding literal",

I know it is quite a stretch to ask - but is it possible to allow more characters as tag values?