source: frontend/node_modules/char-regex/index.js

"use strict"

// Based on: https://github.com/lodash/lodash/blob/6018350ac10d5ce6a5b7db625140b82aeab804df/.internal/unicodeSize.js

module.exports = () => {
        // Used to compose unicode character classes.
        const astralRange = "\\ud800-\\udfff"
        const comboMarksRange = "\\u0300-\\u036f"
        const comboHalfMarksRange = "\\ufe20-\\ufe2f"
        const comboSymbolsRange = "\\u20d0-\\u20ff"
        const comboMarksExtendedRange = "\\u1ab0-\\u1aff"
        const comboMarksSupplementRange = "\\u1dc0-\\u1dff"
        const comboRange = comboMarksRange + comboHalfMarksRange + comboSymbolsRange + comboMarksExtendedRange + comboMarksSupplementRange
        const varRange = "\\ufe0e\\ufe0f"
        const familyRange = "\\uD83D\\uDC69\\uD83C\\uDFFB\\u200D\\uD83C\\uDF93"

        // Used to compose unicode capture groups.
        const astral = `[${astralRange}]`
        const combo = `[${comboRange}]`
        const fitz = "\\ud83c[\\udffb-\\udfff]"
        const modifier = `(?:${combo}|${fitz})`
        const nonAstral = `[^${astralRange}]`
        const regional = "(?:\\uD83C[\\uDDE6-\\uDDFF]){2}"
        const surrogatePair = "[\\ud800-\\udbff][\\udc00-\\udfff]"
        const zwj = "\\u200d"
        const blackFlag = "(?:\\ud83c\\udff4\\udb40\\udc67\\udb40\\udc62\\udb40(?:\\udc65|\\udc73|\\udc77)\\udb40(?:\\udc6e|\\udc63|\\udc6c)\\udb40(?:\\udc67|\\udc74|\\udc73)\\udb40\\udc7f)"
        const family = `[${familyRange}]`

        // Used to compose unicode regexes.
        const optModifier = `${modifier}?`
        const optVar = `[${varRange}]?`
        const optJoin = `(?:${zwj}(?:${[nonAstral, regional, surrogatePair].join("|")})${optVar + optModifier})*`
        const seq = optVar + optModifier + optJoin
        const nonAstralCombo = `${nonAstral}${combo}?`
        const symbol = `(?:${[nonAstralCombo, combo, regional, surrogatePair, astral, family].join("|")})`

        // Used to match [String symbols](https://mathiasbynens.be/notes/javascript-unicode).
        return new RegExp(`${blackFlag}|${fitz}(?=${fitz})|${symbol + seq}`, "g")
}