app/javascript/utils/regex-check.ts
import UAParser from 'ua-parser-js'
declare global {
interface RegExpMatchArray {
indices?: number[][]
}
}
export function areAllRegExpFeaturesSupported(): boolean {
try {
const lookbehindAssertionsTest = new RegExp('(?<=a)b')
if ('ab'.search(lookbehindAssertionsTest) === -1) return false
} catch (e) {
console.log('Lookbehind is not supported:', e)
return false
}
return true
}
function compareVersions(versionA: string, versionB: string): number {
const partsA = versionA.split('.').map(Number)
const partsB = versionB.split('.').map(Number)
for (let i = 0; i < Math.max(partsA.length, partsB.length); i++) {
const partA = partsA[i] || 0
const partB = partsB[i] || 0
if (partA > partB) {
return 1
} else if (partA < partB) {
return -1
}
}
return 0
}
export function isLookbehindSupported(): boolean {
const parser = new UAParser().getBrowser()
switch (parser.name) {
case 'IE':
case 'Opera mini':
return false
case 'Chrome': {
if (parser.version) return compareVersions(parser.version, '62') >= 0
}
case 'Edge': {
if (parser.version) return compareVersions(parser.version, '79') >= 0
}
case 'Firefox': {
if (parser.version) return compareVersions(parser.version, '78') >= 0
}
case 'Safari': {
if (parser.version) return compareVersions(parser.version, '16.4') >= 0
}
case 'Mobile Safari': {
if (parser.version) return compareVersions(parser.version, '16.4') >= 0
}
case 'Opera': {
if (parser.version) return compareVersions(parser.version, '49') >= 0
}
case 'Opera Mobile': {
if (parser.version) return compareVersions(parser.version, '80') >= 0
}
case 'Samsung Internet': {
if (parser.version) return compareVersions(parser.version, '8.2') >= 0
}
case 'UCBrowser': {
if (parser.version) return compareVersions(parser.version, '15.5') >= 0
}
case 'Android Browser': {
if (parser.version) return compareVersions(parser.version, '124') >= 0
}
case 'QQ Browser': {
if (parser.version) return compareVersions(parser.version, '14.9') >= 0
}
case 'Baidu Browser': {
if (parser.version) return compareVersions(parser.version, '13.52') >= 0
}
case 'KaiOS Browser': {
if (parser.version) return compareVersions(parser.version, '3.1') >= 0
}
default:
return true
}
}