Unable to parse lines with URLs inside

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I encounter an error when parsing lines like this:

use Butschster\Prometheus\ParserFactory;

$parser = ParserFactory::create();

$schema = $parser->parse(<<<SCHEMA
some_metric{host="9323832a174b",agent_url="http://container:8080/path",name="CoolMetric"} 3
SCHEMA);

The error message is this:

Phplrt\Parser\Exception\UnrecognizedTokenException: Syntax error, unrecognized "\""
   1. | some_metric{host="9323832a174b",agent_url="http://container:8080/path",name="CoolMetric"} 3
      |                                           ^

Is there something I can do or is this a bug in the software?

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Update: I had introduced a typo when I sanitized my demo output. I have just fixed the issue description, but unfortunately the problem is still real.

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Neither in the grammar.php nor in the EBNF file (which seems to be used for testing) can I find any reference to forward slashed being allowed in the quoted value of the labels. Could this be the issue? Would it be safe to add the slash as a new allowed character or is there some complicated schema behind that needs to be respected?

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Hello @butschster

I played around a bit with the expressions in the Grammar and found a cascade of new problems with the file I need to parse. Not sure how to progress here. If it would only have been one additional char, I'd have prepared a pull request. But with so many differences, I'm kind of doubtful if my file (generated by Telegraf with a Prometheus output plugin) is in any way following a standard. Do you happen to know which schema definition you followed when you created the parser? Perhaps I can see if there should actually be more different variants allowed (which I would gladly contribute) or if I'm better off with a fork that accommodates my weird file.