testDots.js

let files = [
    "Some.Release.2020.9000p.UHD.VR.HDR.EXTREME.5.1.x900-AMAZIN"
]

files.forEach(function(f) {
    
    let newValue = (function (str) {
        // 1) letter and letter
        str = str.replace(/([\D])\.(?=[\D])/g, "$1 ")
        // 2) number and letter
        str = str.replace(/([\d])\.(?=[\D])/g, "$1 ")
        // 3) . 4 numbers (.year)
        str = str.replace(/\.(?=[\d]{4})/g, " ")
        // 4) 4 numbers and 3 or 4 numbers followed by i or p (year and resolution, 2020.1080p)
        str = str.replace(/(\d{4})\.(?=\d{3,4}[ip])/g, "$1 ")
        // 5) S . 2 numbers . 3 or 4 numbers followed by i or p (season and resolution, S01.720p)
        str = str.replace(/(S\d{2})\.(?=\d{3,4}[ip])/g, "$1 ")
        // 6) 2 letters . number . number (DD.2.0 or AAC.2.0 or DD+.2.0 or DTS-X.7.1)
        str = str.replace(/([\D]{2})\.(?=\d\.\d)/g, "$1 ")
        return str
    })(f)

    console.log("Old: " + f)
    console.log("New: " + newValue + "\n")
})