N parameter decrypting fails when dollar sign is in variable name

[azihassan]

I ran into a situation where the throttling challenge's name ($la) includes a dollar sign.

XPa(b.C.toString()));Object.assign(a.j,d);"index.m3u8"===a.j.file&&(delete a.j.file,a.path+="/file/index.m3u8");a.B="";a.url="";a.D&&(b=a.get("n"))&&(b=YPa[0](b),a.set("n",b),YPa.length||$la(""))}};

This causes ThrottlingAlgorithm's solve() method to fail because the regular expression looks for alphabetical names only:

    string findChallengeName()
    {
        return javascript.matchOrFail!(`\|\|([a-zA-Z]{3})\(""\)`, false);
    }

[azihassan]

And then further down in findChallengeImplementation, it fails because the dollar sign isn't escaped.