Highlight escaped backticks in a interpolation string correctly

[ryyppy]

Given following code:

let a = "abc"


let str = "aaa\"bbb"

Js.log(` \` ccc ${a} ddd  `)


Js.log(`a = ${a}`)

Js.log(``)

let b = 34

let parser = %raw(`
  
adsfadsfzz
`)

Will break the syntax highlighting:

We fixed this in rescript-vscode with a negative lookbehind that also matches escaped backticks, but we couldn't get it to work for vim yet.

@amiralies any idea how to solve this? Would be even greater to highlight the escaped backtick in a different color, like in common strings.

[amiralies]

Will take a look tomorrow. It should be trivial