hiddenFalsePositives Regex and Escaping

[TrebledJ]

Hi, I'm using markdown with footnotes. The md syntax looks like

Pineapples on pizza are great.[^ref]

[^ref]: This is a footnote.

Two false positives are generated, one for each [^ref]. If I manually hide the false positives, the JSON is:

{"rule":"MORFOLOGIK_RULE_EN_US","sentence":"^\\QPineapples on pizza are great.^ref\\E$"}
{"rule":"MORFOLOGIK_RULE_EN_US","sentence":"^\\Q^ref: This is a footnote.\\E$"}

I'm now trying to generalise this rule to work for any reference. The idea is to use the regex \^\w+ or \^[a-zA-Z0-9_-]+. I tried littering the sentence with backslashes but to no avail, escaping anything possible.

I tried

"ltex.hiddenFalsePositives": {
    "en-GB": [
        "{\"rule\":\"MORFOLOGIK_RULE_EN_US\",\"sentence\":\"\\\\^\\\\w+\"}",
    ]
},

along with variants with more/less slashes.