/* eslint-disable no-labels */
const similarity = require('similarity');

const debug = true;

module.exports = class FilterUtility {

    constructor() {

        throw new Error('This class cannot be instantiated');

    }

    /*static filter = {
        words: CONFIG.words.map((word) => new RegExp(`(${word})`, 'gi')),
        _words: CONFIG._words,
        links: CONFIG.links
    }*/

    static get REPLACED_CHARS_PATTERNS() {
        return {
            "0": "0|⓪|₀|⁰|𝟢|𝟘|０|𝟎|𝟬|𝟶",
            "1": "⑴|➀|❶|⓵|①|₁|¹|𝟣|𝟙|１|𝟏|𝟭|𝟷",
            "2": "⑵|➋|➁|❷|⓶|②|₂|²|𝟤|𝟚|２|𝟐|𝟮|𝟸",
            "3": "⑶|➌|➂|❸|⓷|③|₃|³|𝟥|𝟛|３|𝟑|𝟯|𝟹",
            "4": "⑷|➍|➃|❹|⓸|④|₄|⁴|𝟦|𝟜|４|𝟒|𝟰|𝟺",
            "5": "⑸|➎|➄|❺|⓹|⑤|₅|⁵|𝟧|𝟝|５|𝟓|𝟱|𝟻",
            "6": "⑹|➏|➅|❻|⓺|⑥|₆|⁶|𝟨|𝟞|６|𝟔|𝟲|𝟼",
            "7": "⑺|➐|➆|❼|⓻|⑦|₇|⁷|𝟩|𝟟|７|𝟕|𝟳|𝟽",
            "8": "⑻|➑|➇|❽|⓼|⑧|₈|⁸|𝟪|𝟠|８|𝟖|𝟴|𝟾",
            "9": "⑼|➒|➈|❾|⓽|⑨|₉|⁹|𝟫|𝟡|９|𝟗|𝟵|𝟿",
            a: [
                "ﾑ|ａ|Ａ|＠|🇦|🅰|🅐|🄰|𝞪|𝞐|𝝰|𝝖|𝜶|𝜜|𝛼|𝛢|𝛂|𝚨|𝚊|𝙰|𝙖|𝘼|𝘢|𝘈|𝗮|𝗔|𝖺|𝖠|𝖆|𝕬|𝕒|𝔸|𝔞|𝔄|𝓪|𝓐|𝒶|𝒜|𝒂|𝑨|𝑎",
                "𝐴|𝐚|𝐀|𐊠|ꭺ|ꓯ|ꓮ|ꋬ|卂|Ɐ|ⓐ|Ⓐ|⒜|⍺|∆|∀|₳|ₐ|ᾼ|Ὰ|Ᾱ|Ᾰ|ᾷ|ᾶ|ᾴ|ᾳ|ᾲ|ᾱ|ᾰ|ᾏ|ᾎ|ᾍ|ᾌ|ᾋ|ᾊ|ᾉ|ᾈ|ᾇ|ᾆ|ᾅ|ᾄ|ᾃ|ᾂ|ᾁ",
                "ᾀ|ὰ|ἇ|ἆ|ἅ|ἄ|ἃ|ἂ|ἁ|ἀ|ặ|Ặ|ẵ|Ẵ|ẳ|Ẳ|ằ|Ằ|ắ|Ắ|ậ|Ậ|ẫ|Ẫ|ẩ|Ẩ|ầ|Ầ|ấ|Ấ|ả|Ả|ạ|Ạ|ẚ|ḁ|Ḁ|ᵃ|ᴬ|ᴀ|ᗩ|ᗅ|ᗄ|Ꮧ|Ꭿ",
                "Ꭺ|ለ|ค|බ|Թ|ӓ|Ӓ|Ѧ|а|Д|А|α|ά|Λ|Δ|Α|Ά|ɒ|ɑ|ɐ|Ⱥ|ȧ|Ȧ|ǻ|Ǻ|ǟ|ǎ|Ǎ|ą|Ą|ă|Ă|ā|Ā|å|ä|ã|â|á|à|Å|Ä|Ã|Â|Á|À",
                "ª|a|@|:regional_indicator_a:"
            ].join("|"),
            b: [
                "ｂ|Ｂ|🇧|🅱|🅑|🄱|𝞫|𝞑|𝝱|𝝗|𝜷|𝜝|𝛽|𝛣|𝛃|𝚩|𝚋|𝙱|𝙗|𝘽|𝘣|𝘉|𝗯|𝗕|𝖻|𝖡|𝖇|𝕻|𝕭|𝕓|𝔹|𝔟|𝔓|𝔅|𝓫|𝓑|𝒷|𝒃|𝑩|𝑏|𝐵|𝐛",
                "𝐁|𐑂|𐌁|𐊡|𐊂|ꮟ|ꞵ|Ꞵ|ꓭ|ꓐ|乃|ⓑ|Ⓑ|⒝|ℬ|ḇ|Ḇ|ḅ|Ḅ|ḃ|Ḃ|ᵇ|ᴮ|ᛒ|ᙠ|ᗷ|ᖯ|ᏼ|Ᏼ|Ᏸ|Ꮟ|ც|Ⴆ|๖|๒|฿|ط|ҍ|ѣ|ь|ъ|в|Ь|В",
                "Б|ϐ|β|Β|ʙ|ɮ|ɞ|ƅ|Ƅ|ƀ|ß|b|:regional_indicator_b:"
            ].join("|"),
            c: [
                "ｃ|Ｃ|🝌|🇨|🅲|🅒|🄲|𝚌|𝙲|𝙘|𝘾|𝘤|𝘊|𝗰|𝗖|𝖼|𝖢|𝖈|𝕮|𝕔|𝔠|𝓬|𝓒|𝒸|𝒞|𝒄|𝑪|𝑐|𝐶|𝐜|𝐂|𐑋|𐐽|𐐣|𐐕|𐌂|𐊢|ꮯ|ꓛ|ꓚ|匚|ⲥ|Ⲥ|ⓒ|Ⓒ|⒞",
                "↻|ↄ|Ↄ|ⅽ|Ⅽ|ℭ|℃|ℂ|₵|ḉ|Ḉ|ᶜ|ᴐ|ᴄ|ᑢ|ᑕ|Ꮳ|Ꮯ|ፈ|ር|ᄃ|ၥ|၁|ང|උ|ҫ|Ҁ|с|С|Ͻ|Ϲ|ϲ|Ϛ|ς|ͻ|ʗ|ɕ|ɔ|Ȼ|ƈ|Ɔ|č|Č|ċ|Ċ|ĉ",
                "Ĉ|ć|Ć|ç|Ç|©|¢|c|:regional_indicator_c:"
            ].join("|"),
            d: [
                "ｄ|Ｄ|🇩|🅳|🅓|🄳|𝚍|𝙳|𝙙|𝘿|𝘥|𝘋|𝗱|𝗗|𝖽|𝖣|𝖉|𝕯|𝕕|𝔻|𝔡|𝔇|𝓭|𝓓|𝒹|𝒟|𝒅|𝑫|𝑑|𝐷|𝐝|𝐃|ꭰ|ꓷ|ꓓ|ꓒ|ⓓ|Ⓓ|⒟|∂|ↁ|ⅾ|Ⅾ",
                "ⅆ|ⅅ|₫|ḓ|Ḓ|ḑ|Ḑ|ḏ|Ḏ|ḍ|Ḍ|ḋ|Ḋ|ᵈ|ᴰ|ᴅ|ᗬ|ᗪ|ᗡ|ᗞ|ᕲ|ᑯ|Ꮷ|Ꮄ|Ꭰ|໓|๔|ծ|ժ|ԃ|ԁ|ɗ|ɖ|ƌ|Ɗ|đ|Đ|ď|Ď|Ð|d|:regional_indicator_d:"
            ].join("|"),
            e: [
                "ﾐ|ｅ|Ｅ|ﻉ|🇪|🅴|🅔|🄴|𝞷|𝞢|𝞔|𝝽|𝝨|𝝚|𝝃|𝜮|𝜠|𝜉|𝛴|𝛦|𝛏|𝚺|𝚬|𝚎|𝙴|𝙚|𝙀|𝘦|𝘌|𝗲|𝗘|𝖾|𝖤|𝖊|𝕰|𝕖|𝔼|𝔢|𝔈|𝓮|𝓔|𝒆|𝑬|𝑒|𝐸",
                "𝐞|𝐄|𐐩|𐐁|𐊆|ꮛ|ꭼ|ꬲ|ꞓ|ꝫ|ꓱ|ꓰ|乇|㉫|ⵉ|ⴺ|ⴹ|ⳍ|ⲉ|ⓔ|Ⓔ|⒠|⋿|⋴|∑|∊|∈|∃|ⅇ|⅀|ℰ|ℯ|℮|ℇ|€|ₑ|Ὲ|ὲ|Ἕ|Ἔ|Ἓ|Ἒ|Ἑ|Ἐ|ἕ",
                "ἔ|ἓ|ἒ|ἑ|ἐ|ệ|Ệ|ễ|Ễ|ể|Ể|ề|Ề|ế|Ế|ẽ|Ẽ|ẻ|Ẻ|Ẹ|ḝ|Ḝ|ḛ|Ḛ|ḙ|Ḙ|ḗ|Ḗ|ḕ|Ḕ|ᵉ|ᴱ|ᴈ|ᴇ|ᘿ|ᗴ|Ꮛ|Ꭼ|ჳ|ཇ|ԑ|Ԑ|ӡ|ә|Ә|ҿ|ҽ",
                "є|э|з|е|Е|ϵ|ξ|ε|έ|Σ|Ξ|Ε|ʒ|ɜ|ɛ|ə|ɘ|Ɇ|ȝ|ǝ|ƺ|Ʃ|Ɛ|Ə|Ǝ|ě|Ě|ę|Ę|ė|Ė|ĕ|Ĕ|ē|Ē|ë|ê|é|è|Ë|Ê|É|È|£|e|:regional_indicator_e:"
            ].join("|"),
            f: [
                "ｆ|Ｆ|ךּ|🇫|🅵|🅕|🄵|𝟋|𝚏|𝙵|𝙛|𝙁|𝘧|𝘍|𝗳|𝗙|𝖿|𝖥|𝖋|𝕱|𝕗|𝔽|𝔣|𝔉|𝓯|𝓕|𝒻|𝒇|𝑭|𝑓|𝐹|𝐟|𝐅|𐊥|𐊇|ꬵ|ꟻ|ꞙ|Ꞙ|ꜰ|ꓞ|ꓝ|千|ⓕ|Ⓕ",
                "⒡|Ⅎ|ℱ|℉|₣|ẝ|ḟ|Ḟ|ᶠ|ᖷ|ᖵ|ᖴ|Ꮈ|ན|ғ|ϝ|Ϝ|ʄ|ɟ|ƒ|Ƒ|ſ|f|:regional_indicator_f:"
            ].join("|"), // conflicts with T: Ŧ
            g: [
                "ｇ|Ｇ|ﻮ|פֿ|𠂎|🇬|🅶|🅖|🄶|𝚐|𝙶|𝙜|𝙂|𝘨|𝘎|𝗴|𝗚|𝗀|𝖦|𝖌|𝕲|𝕘|𝔾|𝔤|𝔊|𝓰|𝓖|𝒢|𝒈|𝑮|𝑔|𝐺|𝐠|𝐆|ꮐ|ꓖ|ⓖ|Ⓖ|⒢|⅁|ℊ|₲|ḡ",
                "Ḡ|ᶃ|ᵍ|ᴳ|ᘜ|ᏻ|Ᏻ|Ꮹ|Ꮐ|Ꮆ|ງ|ق|ց|ԍ|Ԍ|Б|ʛ|ɢ|ɡ|ɠ|ɓ|ǵ|Ǵ|ǫ|ǧ|Ǧ|Ǥ|ƃ|ģ|Ģ|ġ|Ġ|ğ|Ğ|ĝ|Ĝ|g|:regional_indicator_g:"
            ].join("|"),
            h: [
                "ｈ|Ｈ|🇭|🅷|🅗|🄷|𝞖|𝝜|𝜢|𝛨|𝚮|𝚑|𝙷|𝙝|𝙃|𝘩|𝘏|𝗵|𝗛|𝗁|𝖧|𝖍|𝕳|𝕙|𝔥|𝓱|𝓗|𝒽|𝒉|𝑯|𝐻|𝐡|𝐇|𐋏|ꮋ|ꓧ|卄|ん|Ⲏ|Ⱨ|ⓗ",
                "Ⓗ|⒣|ℎ|ℍ|ℌ|ℋ𝑖|ℋ|ₕ|ῌ|Ὴ|ᾟ|ᾞ|ᾝ|ᾜ|ᾛ|ᾚ|ᾙ|ᾘ|Ἧ|Ἦ|Ἥ|Ἤ|Ἣ|Ἢ|Ἡ|Ἠ|ẖ|ḫ|Ḫ|ḩ|Ḩ|ḧ|Ḧ|ḥ|Ḥ|ḣ|Ḣ|ᴴ|ᕼ|Ᏺ|Ꮒ|Ꮋ|ዠ|ዞ",
                "հ|ԋ|Ԋ|Ӊ|ӈ|һ|ђ|н|Н|Ћ|Η|Ή|ʱ|ʰ|ʜ|ɧ|ɦ|ɥ|Ƕ|ħ|Ħ|ĥ|Ĥ|h|:regional_indicator_h:"
            ].join("|"),
            i: [
                "ﾉ|ｉ|Ｉ|！|ﺍ|ﺁ|🇮|🅸|🅘|🄸|𝚒|𝙸|𝙞|𝙄|𝘪|𝘐|𝗶|𝗜|𝗂|𝖨|𝖎|𝕴|𝕚|𝕀|𝔦|𝓲|𝓘|𝒾|𝒊|𝑰|𝑗|𝑖|𝐼|𝐢|𝐈|𐌠|𐌉|𐊊|ꭵ|ꙇ|ꓲ|丨|ⵑ|ⵏ|Ⲓ|ⓘ|Ⓘ|⒤|⍳|∣",
                "ⅼ|ⅰ|Ⅰ|ⅈ|ℹ|ℑ|ℐ|ⁱ|Ὶ|Ῑ|Ῐ|ῗ|ῖ|ῒ|ῑ|ῐ|ὶ|Ἷ|Ἶ|Ἵ|Ἴ|Ἳ|Ἲ|Ἱ|Ἰ|ἷ|ἶ|ἵ|ἴ|ἳ|ἲ|ἱ|ἰ|ị|Ị|ỉ|Ỉ|ḯ|Ḯ|ḭ|Ḭ|ᶤ|ᵢ|ᴵ|ᛁ|ᓰ|Ꮖ|Ꭵ|ར",
                "เ|ߊ|۱|ٱ|١|ا|أ|آ|ו|׀|ӏ|ї|і|І|ϊ|ι|ί|Ι|ΐ|ɪ|ɨ|ǐ|Ǐ|ǃ|Ɨ|ł|ı|İ|į|Į|ĭ|Ĭ|ī|Ī|ĩ|Ĩ|ï|î|í|ì|Ï|Î|Í|Ì|¡|i",
                "\\￨|\\ǀ|:regional_indicator_i:"
            ].join("|"),
            j: [
                "ﾌ|ｊ|Ｊ|ﻝ|🇯|🅹|🅙|🄹|𝚓|𝙹|𝙟|𝙅|𝘫|𝘑|𝗷|𝗝|𝗃|𝖩|𝖏|𝕵|𝕛|𝕁|𝔧|𝔍|𝓳|𝓙|𝒿|𝒥|𝒋|𝑱|𝐽|𝐣|𝐉|ꭻ|Ʝ|ꞁ|ꓙ|ⱼ|ⓙ|Ⓙ|⒥|ⅉ|ᴶ|ᴊ|ᒚ|ᒎ|ᒍ|Ꮰ|Ꭻ|ว",
                "ڶ|ل|ز|נ|ן|ј|Ј|ϳ|Ϳ|ʲ|ʝ|Ɉ|ǰ|ĵ|Ĵ|j|:regional_indicator_j:"
            ].join("|"),
            k: [
                "ｋ|Ｋ|🇰|🅺|🅚|🄺|𝟆|𝞳|𝞙|𝞌|𝝹|𝝟|𝝒|𝜿|𝜥|𝜘|𝜅|𝛫|𝛞|𝛋|𝚱|𝚔|𝙺|𝙠|𝙆|𝘬|𝘒|𝗸|𝗞|𝗄|𝖪|𝖐|𝕶|𝕜|𝕂|𝔨|𝔎|𝓴|𝓚|𝓀|𝒦|𝒌|𝑲",
                "𝑘|𝐾|𝐤|𝐊|𐒼|ꮶ|Ꝁ|ꓗ|ⲕ|Ⲕ|ⓚ|Ⓚ|⒦|⋊|K|₭|ₖ|ḵ|Ḵ|ḳ|Ḳ|ḱ|Ḱ|ᵏ|ᴷ|ᴋ|ᛕ|ᖽᐸ|Ꮶ|ӄ|Ӄ|Ҡ|ҟ|Ҝ|қ|к|К|Ќ|ϰ|ϗ|κ|Κ|ʞ|ƙ|ĸ",
                "ķ|Ķ|k|:regional_indicator_k:"
            ].join("|"),
            l: [
                "ﾚ|ｌ|Ｌ|ﺎ|ﺂ|🇱|🅻|🅛|🄻|𝚕|𝙻|𝙡|𝙇|𝘭|𝘓|𝗹|𝗟|𝗅|𝖫|𝖑|𝕷|𝕝|𝕃|𝔩|𝔏|𝓵|𝓛|𝓁|𝒍|𝑳|𝑙|𝐿|𝐥|𝐋|𐑃|𐐛|ꮮ|Ꝉ|ꓡ|ㄥ|し|ⳑ|Ⳑ|Ⱡ|ⓛ|Ⓛ|⒧",
                "Ⅼ|⅃|⅂|ℓ|ℒ|ₗ|ḽ|Ḽ|ḻ|Ḻ|ḹ|Ḹ|ḷ|Ḷ|ᴸ|ᒺ|ᒪ|Ꮮ|Ꮭ|Ꮁ|ᄂ|Ӏ|ˡ|ʟ|ʆ|ʅ|ɭ|ɫ|ƪ|Ɩ|ł|Ł|ŀ|Ŀ|ľ|Ľ|ļ|Ļ|ĺ|Ĺ|l|:regional_indicator_l:"
            ].join("|"),
            m: [
                "ﾶ|ｍ|Ｍ|🇲|🅼|🅜|🄼|𝞛|𝝡|𝜧|𝛭|𝚳|𝚖|𝙼|𝙢|𝙈|𝘮|𝘔|𝗺|𝗠|𝗆|𝖬|𝖒|𝕸|𝕞|𝕄|𝔪|𝔐|𝓶|𝓜|𝓂|𝒎|𝑴|𝑚|𝑀|𝐦|𝐌|𐌑",
                "𐊰|ꮇ|ꓟ|爪|Ⲙ|ⓜ|Ⓜ|⒨|Ⅿ|ℳ|₥|ₘ|ṃ|Ṃ|ṁ|Ṁ|ḿ|Ḿ|ᵐ|ᴹ|ᴍ|៣|ᛖ|ᘻ|ᗰ|Ꮇ|๓|Ӎ|м|М|ϻ|Ϻ|Μ|ʍ|ɱ|ɯ|m|:regional_indicator_m:"
            ].join("|"),
            n: [
                "ｎ|Ｎ|🇳|🅽|🅝|🄽|𝞜|𝝢|𝜨|𝛮|𝚴|𝚗|𝙽|𝙣|𝙉|𝘯|𝘕|𝗻|𝗡|𝗇|𝖭|𝖓|𝕹|𝕟|𝔫|𝔑|𝓷|𝓝|𝓃|𝒩|𝒏|𝑵|𝑛|𝑁|𝐧|𝐍|𐑍|𐐥|ꓵ|ꓠ|刀|几",
                "Ⲡ|Ⲛ|ⓝ|Ⓝ|⒩|⋂|∏|ℿ|ℕ|₦|ₙ|ⁿ|ῇ|ῆ|ῄ|ῃ|ῂ|ᾗ|ᾖ|ᾕ|ᾔ|ᾓ|ᾒ|ᾑ|ᾐ|ὴ|ἧ|ἦ|ἥ|ἤ|ἣ|ἢ|ἡ|ἠ|ṋ|Ṋ|ṉ|Ṉ|ṇ|Ṇ|ṅ|Ṅ|ᶰ|ᴺ|ᴎ|ហ|\\/\\\\/",
                "ᘉ|ᑎ|Ꮑ|ቡ|በ|ຖ|ภ|ก|מ|ռ|ո|ղ|Ռ|Ո|ӣ|ѝ|й|и|П|Й|И|Ѝ|Ϟ|η|ή|Π|Ν|ͷ|Ͷ|ɴ|ɳ|ɲ|Ǹ|ƞ|Ɲ|ŋ|ʼn|ň|Ň|ņ|Ņ|ń|Ń|ñ|Ñ|n|:regional_indicator_n:"
            ].join("|"),
            o: [
                "ｏ|Ｏ|ﻬ|ﻫ|ﻪ|ﻩ|ﮭ|ﮬ|ﮫ|ﮪ|ﮩ|ﮨ|ﮧ|ﮦ|🇴|🅾|🅞|🄾|𝞼|𝞸|𝞞|𝞂|𝝾|𝝤|𝝈|𝝄|𝜪|𝜎|𝜊|𝛰|𝛔|𝛐|𝚶|𝚘|𝙾|𝙤|𝙊|𝘰|𝘖|𝗼|𝗢|𝗈|𝖮|𝖔|𝕺",
                "𝕠|𝕆|𝔬|𝔒|𝓸|𝓞|𝒪|𝒐|𝑶|𝑜|𝑂|𝐨|𝐎|𐓪|𐓃|𐓂|𐐬|𐐄|𐊫|𐊒|ꬽ|Ꙩ|ꓳ|㊉|ㄖ|の|〇|ⵙ|ⵔ|ⲟ|Ⲟ|⨀|✿|☉|ⓞ|Ⓞ|⒪|⍥|⊙|∅|ℴ|ₒ",
                "Ὼ|Ὸ|ᾯ|ᾮ|ᾭ|ᾬ|ᾫ|ᾪ|ᾩ|ᾨ|ὸ|Ὧ|Ὦ|Ὥ|Ὤ|Ὣ|Ὢ|Ὡ|Ὠ|Ὅ|Ὄ|Ὃ|Ὂ|Ὁ|Ὀ|ὅ|ὄ|ὃ|ὂ|ὁ|ὀ|ỡ|Ỡ|ở|Ở|ờ|Ờ|ớ|Ớ|ộ|Ộ|Ỗ|ổ|Ổ|ồ|Ồ|ố|Ố|ỏ|Ỏ",
                "ọ|Ọ|ṓ|Ṓ|ṑ|Ṑ|ṏ|Ṏ|ṍ|Ṍ|ð|ᵒ|ᴼ|ᴑ|ᴏ|ᗝ|ᓍ|Ꮎ|Ꭷ|ዐ|ჿ|၀|ဝ|໐|๐|๏|ට|൦|ഠ|೦|౦|௦|୦|ଠ|૦|੦|০|०|߀|۵|۝|ە|ہ|ھ|٥|ه|ס|օ",
                "Օ|Ө|ӧ|Ӧ|ѻ|о|Ф|О|ό|φ|σ|ο|θ|Ο|Θ|˚|ʘ|ǿ|Ǿ|ǒ|Ǒ|Ʊ|ơ|Ơ|ő|Ő|ŏ|Ŏ|ō|Ō|ø|ö|õ|ô|ó|ò|ð|Ø|Ö|Õ|Ô|Ó|Ò|º|°|o|♡|:regional_indicator_o:"
            ].join("|"),
            p: [
                "ｱ|ｐ|Ｐ|🇵|🅿|🅟|🄿|𝟈|𝞺|𝞠ϱ|𝞠|𝞎|𝞀|𝝦|𝝔|𝝆|𝜬|𝜚|𝜌|𝛲|𝛠|𝛒|𝚸|𝚙|𝙿|𝙥|𝙋|𝘱|𝘗|𝗽|𝗣|𝗉|𝖯|𝖕|𝕡|𝔭|𝓹|𝓟|𝓅|𝒫|𝒑|𝑷|𝑝|𝑃|𝐩|𝐏",
                "𐓄|𐊕|ꮲ|ꓑ|卩|ⲣ|Ⲣ|Ᵽ|ⓟ|Ⓟ|⒫|⍴|ℙ|℘|₱|ₚ|‽|Ῥ|ῥ|ῤ|ṗ|Ṗ|ṕ|Ṕ|ᵖ|ᴾ|ᴩ|ᴘ|ᕵ|ᑭ|Ꮲ|Ꭾ|ק|ք|բ|Ԁ|Ҏ|р|Р|ϸ|Ϸ|ϱ|ρ|Ρ|ƿ|Ƥ|þ|Þ|¶",
                "p|:regional_indicator_p:"
            ].join("|"),
            q: [
                "ｑ|Ｑ|🇶|🆀|🅠|🅀|𝚚|𝚀|𝙦|𝙌|𝘲|𝘘|𝗾|𝗤|𝗊|𝖰|𝖖|𝕼|𝕢|𝔮|𝔔|𝓺|𝓠|𝓆|𝒬|𝒒|𝑸|𝑞|𝑄|𝐪|𝐐|𐌒|𐊭|ꟼ|Ꝗ|ゐ|ⵕ|ⓠ|Ⓠ|⒬|ℚ|ợ|ᶐ|ᕴ",
                "ᑫ|Ꭴ|๑|۹|ף|զ|գ|ԛ|Ҩ|ϥ|ϙ|Ϙ|Ω|ʠ|ɋ|Ɋ|ǭ|Ǭ|Ǫ|ƍ|q|:regional_indicator_q:"
            ].join("|"),
            r: [
                "ｒ|Ｒ|🇷|🆁|🅡|🅁|𝞒|𝝘|𝜞|𝛤|𝚪|𝚛|𝚁|𝙧|𝙍|𝘳|𝘙|𝗿|𝗥|𝗋|𝖱|𝖗|𝕽|𝕣|𝔯|𝓻|𝓡|𝓇|𝒓|𝑹|𝑟|𝑅|𝐫|𝐑|𐒴|ꮢ|ꮁ|ꭱ|ꭈ|ꭇ|ꓣ|尺|ⲅ|Ɽ|ⓡ|Ⓡ|⒭|℞",
                "ℝ|ℜ|ℛ|ṟ|Ṟ|ṝ|Ṝ|ṛ|Ṛ|ṙ|Ṙ|ᵣ|ᴿ|ᴦ|ᴚ|ᴙ|ᚱ|ᖇ|Ꮢ|Ꭱ|འ|ཞ|ર|ր|Ի|я|г|Я|ʳ|ʁ|ʀ|ɿ|ɾ|ɼ|ɹ|Ɍ|Ʀ|ř|Ř|ŗ|Ŗ|ŕ|Ŕ|®|r|:regional_indicator_r:"
            ].join("|"),
            s: [
                "ｓ|Ｓ|＄|ﮎ|🇸|🆂|🅢|🅂|𝚜|𝚂|𝙨|𝙎|𝘴|𝘚|𝘀|𝗦|𝗌|𝖲|𝖘|𝕾|𝕤|𝕊|𝔰|𝔖|𝓼|𝓢|𝓈|𝒮|𝒔|𝑺|𝑠|𝑆|𝐬|𝐒|𐑈|𐐠|𐊖|ꮪ|ꜱ|ꙅ|Ꙅ|ꓢ|꒚|丂|ⓢ|Ⓢ|⒮|∫|₴",
                "ₛ|ṩ|Ṩ|ṧ|Ṧ|ṥ|Ṥ|ṣ|Ṣ|ṡ|Ṡ|ᴤ|ᔕ|Ꮪ|Ꮥ|Ꭶ|ร|ى|ֆ|Տ|ѕ|Ѕ|ϩ|ˢ|ʃ|ʂ|Ș|ƽ|ƨ|Ƨ|š|Š|ş|Ş|ŝ|Ŝ|ś|Ś|§|s|\\$|:regional_indicator_s:"
            ].join("|"),
            t: [
                "ｲ|ｨ|ｔ|Ｔ|🇹|🆃|🅣|🅃|𝞽|𝚝|𝚃|𝙩|𝙏|𝘵|𝘛|𝘁|𝗧|𝗍|𝖳|𝖙|𝕿|𝕥|𝕋|𝔱|𝔗|𝓽|𝓣|𝓉|𝒯|𝒕|𝑻|𝑡|𝑇|𝐭|𝐓|𐌕|𐊱|𐊗|ꭲ|ꓔ|꓄|丅|ㄒ|Ⲧ|Ⲅ|⟙|ⓣ|Ⓣ|⒯",
                "⊥|⊤|ℾ|₮|ₜ|†|ẗ|ṱ|Ṱ|ṯ|Ṯ|ṭ|Ṭ|ṫ|Ṫ|ᵗ|ᵀ|ᴛ|ᖶ|ᒥ|Ꮦ|Ꮏ|Ꮁ|Ꭲ|ኮ|ح|է|Շ|Ի|Ե|ҭ|т|Т|Г|ϯ|Ϯ|τ|π|Τ|Γ|Ͳ|ʈ|ʇ|ɬ|ȶ|ț|Ț|ǂ|Ʈ|Ƭ|ƫ|ƚ",
                "ŧ|ť|Ť|ţ|Ţ|t|:regional_indicator_t:"
            ].join("|"), // conflicts with F: Ŧ
            u: [
                "ｕ|Ｕ|🇺|🆄|🅤|🅄|𝞵|𝝻|𝝁|𝜇|𝛍|𝚞|𝚄|𝙪|𝙐|𝘶|𝘜|𝘂|𝗨|𝗎|𝖴|𝖚|𝖀|𝕦|𝕌|𝔲|𝔘|𝓾|𝓤|𝓊|𝒰|𝒖|𝑼|𝑢|𝑈|𝐮|𝐔|𐓶|𐓎|ꭒ|ꭎ|ꞟ|ꓴ|ㄩ|ひ|ⓤ",
                "Ⓤ|⒰|⋃|∪|∩|℧|ῧ|ῦ|ῢ|ῡ|ῠ|ὺ|ὗ|ὖ|ὕ|ὔ|ὓ|ὒ|ὑ|ὐ|ự|Ự|Ữ|ử|Ử|ừ|Ừ|ứ|Ứ|ủ|Ủ|ụ|Ụ|ṻ|Ṻ|ṹ|Ṹ|ṷ|Ṷ|ṵ|Ṵ|ṳ|Ṳ|ᵾ|ᵤ|ᵘ|ᵁ|ᴜ|ᘴ|ᘮ",
                "ᓑ|ᑘ|ᑌ|ᐡ|Ꮼ|ሆ|ሀ|ย|น|પ|և|ս|մ|Ս|Մ|Ц|ύ|ϋ|υ|μ|ΰ|ʋ|ʊ|Ʉ|Ȕ|ǜ|Ǜ|ǚ|Ǚ|ǘ|Ǘ|ǖ|Ǖ|ǔ|Ǔ|Ʊ|ư|Ư|ų|Ų|ű|Ű|ů|Ů|ŭ|Ŭ|ū|Ū|ũ|Ũ|û",
                "ú|ù|Ü|Û|Ú|Ù|µ|u|:regional_indicator_u:"
            ].join("|"),
            v: [
                "ｖ|Ｖ|🇻|🆅|🅥|🅅|𝝼|𝝂|𝜈|𝛎|𝚟|𝚅|𝙫|𝙑|𝘷|𝘝|𝘃|𝗩|𝗏|𝖵|𝖛|𝖁|𝕧|𝕍|𝔳|𝔙|𝓿|𝓥|𝓋|𝒱|𝒗|𝑽|𝑣|𝑉|𝐯|𝐕|𐓘|𐒰|𐌡|𐊍|ꮩ|ꓦ|ꓥ|ⴸ|ⴷ|ⱽ|ⓥ|Ⓥ",
                "⒱|⋁|∨|√|ⅴ|Ⅴ|℣|ṿ|Ṿ|ṽ|Ṽ|ᵥ|ᵛ|ᴧ|ᴠ|ᐺ|ᐱ|ᐯ|Ꮩ|Ꮙ|ง|۸|۷|٨|٧|ש|ע|ט|Ѷ|ѵ|Ѵ|Л|ν|Λ|ʌ|ʋ|Ʌ|Ɣ|v|:regional_indicator_v:"
            ].join("|"),
            w: [
                "ｗ|Ｗ|🇼|🆆|🅦|🅆|𝟉|𝟂|𝞏|𝞈|𝝕|𝝎|𝜛|𝜔|𝜋|𝛡|𝛚|𝛑|𝚠|𝚆|𝙬|𝙒|𝘸|𝘞|𝘄|𝗪|𝗐|𝖶|𝖜|𝖂|𝕨|𝕎|𝔴|𝔚|𝔀|𝓦|𝓌|𝒲|𝒘|𝑾|𝑤",
                "𝑊|𝐰|𝐖|𐓑|ꮃ|ꞷ|ꙍ|ꓪ|山|ⲱ|ⓦ|Ⓦ|⒲|⍵|ℼ|₩|ῷ|ῶ|ῴ|ῳ|ῲ|ẘ|ẉ|Ẉ|ẇ|Ẇ|ẅ|Ẅ|ẃ|Ẃ|ẁ|Ẁ|ᵂ|ᴡ|ᘺ|ᗯ|Ꮿ|Ꮤ|Ꮚ|Ꮗ|Ꮃ|ሠ|ཡ|ຟ|ฬ",
                "ฝ|చ|ա|ԝ|Ԝ|ѡ|Ѡ|ш|Щ|ϖ|ώ|ω|ψ|ʷ|ʍ|ɯ|ŵ|Ŵ|w|:regional_indicator_w:"
            ].join("|"),
            x: [
                "ﾒ|ｘ|Ｘ|אָ|אַ|🇽|🆇|🅧|🅇|𝟀|𝞆|𝝌|𝜒|𝛘|𝚡|𝚇|𝙭|𝙓|𝘹|𝘟|𝘅|𝗫|𝗑|𝖷|𝖝|𝖃|𝕩|𝕏|𝔵|𝔛|𝔁|𝓧|𝓍|𝒳|𝒙|𝑿|𝑥|𝑋|𝐱|𝐗|𐌢|𐌗|𐊴|𐊐|ꭕ|ꭓ|Ꭓ|ꓫ|꒼",
                "乂|〤|ⵝ|ⲭ|Ⲭ|⨯|⤬|⤫|╳|ⓧ|Ⓧ|⒳|⌧|ⅹ|Ⅹ|ℵ|ₓ|ẍ|Ẍ|ẋ|Ẋ|ᚷ|᙮|᙭|ᕽ|ᕁ|ጀ|ჯ|א|Ӿ|Ӽ|ҳ|х|Х|Ж|χ|Χ|ˣ|ɤ|×|x|:regional_indicator_x:"
            ].join("|"),
            y: [
                "ﾘ|ｙ|Ｙ|🇾|🆈|🅨|🅈|𝞬|𝝲|𝜸|𝛾|𝛄|𝚢|𝚈|𝙮|𝙔|𝘺|𝘠|𝘆|𝗬|𝗒|𝖸|𝖞|𝖄|𝕪|𝕐|𝔶|𝔜|𝔂|𝓨|𝓎|𝒴|𝒚|𝒀|𝑦|𝑌|𝐲|𝐘|𐊲|ꭚ|ꓬ|ꐯ|ꌦ|ㄚ|Ⲩ|ⓨ|Ⓨ|⒴",
                "⅄|ℽ|Ὺ|Ῡ|Ῠ|Ὗ|Ὕ|Ὓ|Ὑ|ỿ|ỹ|Ỹ|ỷ|Ỷ|ỵ|Ỵ|ỳ|Ỳ|ẙ|ẏ|Ẏ|ᶌ|ᖻ|Ꮍ|Ꭹ|ყ|ฯ|ץ|վ|կ|Ӳ|Ӌ|ұ|ү|Ү|ч|у|У|Ў|ϔ|ϓ|ϒ|γ|Υ|Ύ|ˠ|ʸ|ʏ|ʎ|ɣ|Ɏ|Ƴ",
                "Ÿ|ŷ|Ŷ|ÿ|ý|Ý|¥|y|:regional_indicator_y:"
            ].join("|"),
            z: [
                "ｚ|Ｚ|🇿|🆉|🅩|🅉|𝚣|𝚉|𝙯|𝙕|𝘻|𝘡|𝘇|𝗭|𝗓|𝖹|𝖟|𝖅|𝕫|𝔷|𝔃|𝓩|𝓏|𝒵|𝒛|𝒁|𝑧|𝑍|𝐳|𝐙|ꮓ|ꓜ|乙|Ⱬ|☡|ⓩ|Ⓩ|⒵|ℨ|ℤ|ẕ|Ẕ|ẓ|Ẓ|ẑ|Ẑ|ᶻ|ᴢ|ᙆ",
                "ᘔ|Ꮓ|ፚ|ຊ|չ|ζ|Ζ|ʑ|ʐ|ɀ|ȥ|ƹ|ƶ|Ƶ|ž|Ž|ż|Ż|ź|Ź|z|:regional_indicator_z:"
            ].join("|"),
            " ": "\\s+", // multiple whitespace -> space
            ".": "．",
            ",": "，|‘",
            "?": "？"
        };
    }

    static get REGEX() {
        return {
            invite: /((discord\s?\.\s?gg\s?\/)|(discord(app)?\s?\.\s?com\/invite\/))(\s*?[a-z0-9]+)/giu,
            link: /(https?:\/\/(www\.)?)?(([a-z0-9-]{1,63}\.)?([a-z0-9-]{2,63})(\.[a-z0-9-]{2,63})(\.[a-z0-9-]{2,63})?)/iu,
            // eslint-disable-next-line camelcase
            link_g: /(https?:\/\/(www\.)?)?(([a-z0-9-]{1,63}\.)?([a-z0-9-]{2,63})(\.[a-z0-9-]{2,63})(\.[a-z0-9-]{2,63})?)/iug,
            emoji: /<a?:[a-z0-9_-]{2,}:[0-9]{17,22}>/giu,
            letters: Array.from(Object.entries(this.REPLACED_CHARS_PATTERNS)).reduce((obj, [key, val]) => {
                // eslint-disable-next-line require-unicode-regexp
                obj[key] = new RegExp(val, 'gm');
                return obj;
            }, {})
        };
    }

    static normalize(content) {

        if (typeof content !== 'string') throw new Error('Invalid input type, must be of type string');
        if (!content || !content.length) return '';

        //Zero width character (UTF-16 8206)
        content = content.replace(/‎/gu, '');

        //Replace the weird letters with their normal text counterparts 
        // eslint-disable-next-line no-useless-escape
        const match = (/[a-z0-9\w\(\)\.\\\/\?!]+/gimu).exec(content);
        if (!(match && match[0].length === content.length)) {
            for (const char of Object.keys(this.REGEX.letters)) {
                content = content.replace(this.REGEX.letters[char], char);
            }
        }
        //if (debug) console.log('weird char regex: ' + content);

        //Remove duplicate characters
        const words = content.split(' ');
        for (let i = 0; i < words.length; i++) {
            if (words[i].length === 0) {
                words.splice(i, 1);
                i--;
            }

            if (this.REGEX.link.test(words[i])) continue;

            const letters = words[i].split('');
            for (let j = 1; j < letters.length - 1; j++) {
                if (letters[j - 1] === letters[j] && letters[j] === letters[j + 1]) {
                    letters.splice(j, 1);
                    j--;
                }
            }
            words[i] = letters.join('');
        }

        content = words.join(' ');
        //if (debug) console.log('dupes: ' + content);
        return content;

    }

    /**
     * Filter words explicitly
     *
     * @static
     * @param {Array<String>} [words=[]]
     * @param {Array<String>} [filterList=[]] 
     * @return {Object} 
     */
    static filterExplicit(words = [], filterList = []) {
        for (const word of filterList) {
            //Do it like this instead of regex so it doesn't match stuff like Scunthorpe with cunt
            if (words.some((_word) => _word === word)) {
                this.client.logger.debug(`\nMessage matched with "${word}" in the explicit list.\nFull content: ${content}`);
                return {
                    match: word,
                    matched: true,
                    matcher: 'explicit',
                    _matcher: word,
                    type: 'explicit'
                };
            }

        }
    }

    static global(content) {

        content = this._links(content);
        content = this._words(content);
        return content;

    }

    static _links(content) {

        if (!content || !content.length) return '';
        const domains = this.filter.links;
        const regex = this.REGEX.link;
        // eslint-disable-next-line camelcase
        const regex_g = this.REGEX.link_g;
        const matches = content.match(regex_g);
        //console.log(content.match(this.regex.link_g))
        if (!matches) return content;

        outer:
        for (const match of matches) {
            for (const domain of domains) {
                if (match.includes(domain)) {
                    content = content.replace(match, '`<REDACTED: link (g)>`');
                    continue outer;
                }
            }
        }

        //console.log('[pre link filter]', content)
        // for (const domain of domains) {
        //     while (regex.test(content) && content.includes(domain)) {
        //         const match = content.match(regex);
        //         content = content.replace(match[0], '`<REDACTED: link (g)>`');
        //     }
        // }
        //console.log('[post link filter]', content)
        return content;

    }

    static _words(content) {

        if (!content || !content.length) return '';
        const regex = this.filter.words;

        //console.log('[pre word filter]', content)
        //console.log('[pre regex]:', content);
        const words = content.replace('\n', '\n ').split(' ');
        for (const reg of regex) {
            if (reg.test(content)) {
                console.log(reg);
                content = content.replace(reg, '`<REDACTED: word (g)>`');
            }
            
            const text = content.replace(/\s/gu, '');
            if (reg.test(text)) {
                content = '`<REDACTED: message (g)>`';
            }

        }

        //console.log('[pre similarity]:', content)
        for (const word of words) {
            if (!content.includes(word)) continue;
            for (const _word of this.filter._words) {
                if (similarity(word, _word) >= 0.93 - 0.15 * Math.log(word.length)) {
                    console.log('[similarity]:', word, _word);
                    content = content.replace(word, '`<REDACTED: word (g)>`');
                }
            }
        }

        //console.log('[post word filter]',content);

        // if (regex.test(content)) {
        //     console.log('ping')
        //     const words = content.split(' ');
        //     console.log(words);
        //     for (const word of words) {
        //         const [match] = word.match(regex);
        //         console.log(match)
        //         if (match === word) content = content.replace(regex, '`<REDACTED: word>`');
        //     }
        //     //return content.replace(regex, '`<REDACTED: word>`');
        // }
        return content;

    }

    static invites(content) {

        if (this.REGEX.invite.test(content)) return content.replace(this.REGEX.invite, '`<REDACTED: invite>`');
        return content;

    }

    static links(content, options) {

        //console.log('1',content)
        const matches = content.match(REGEX.link_g);
        //console.log(matches)
        if (matches) {

            for (const match of matches) {
                let safe = false;
                for (const domain of options.whitelist) {
                    if (match.includes(domain)) {
                        safe = true;
                        break;
                    }
                }
                if (!safe) content = content.replace(match, '`<REDACTED: link>`');
            }

        }

        //console.log('2', content)
        return content;

    }

    static words(content, filter) {

        const { exact, inexact } = filter;

        // console.log(exact);
        // console.log(new RegExp(`(${exact.join('|')})`, 'giu'))

        if (exact.length) content = content.replace(new RegExp(`(${exact.join('|')})`, 'giu'), '`<REDACTED: word>`');
        if (inexact.length) {

            for (const word of inexact) {

                const words = content.replace('\n', '\n ').split(' ');
                for (const _word of words) {
                    const sim = similarity(word, _word);
                    console.log(_word, word, sim, 0.95 - 0.15 * Math.log(_word.length));
                    if (sim >= 0.93 - 0.15 * Math.log(word.length)) {
                        console.log('[similarity]:', word, _word);
                        content = content.replace(_word, '`<REDACTED: word>`');
                    }
                }

                const text = content.replace(/\s/gu, '');
                if (text.includes(word)) {
                    return '`<REDACTED: message>`';
                }

            }

        }

        return content;

    }

    static emojis(content) {

        if (this.REGEX.emoji.test(content)) return content.replace(this.REGEX.emoji, '`<REDACTED: emoji>`');
        return content;

    }

};