Validate only English regex

OnlyEnglish.swift

    private func validateQuestionLanguage(_ question: String) -> Bool {
        if question.isEmpty { return true }
        do {
            let regex = try NSRegularExpression(pattern: "^[a-zA-Z0-9\"$@$!%*?&#^-_. +()_\\-=\\[\\]{};:\\|,<>\\/?]+$", options: .caseInsensitive)
            return regex.matches(in: question, options: [], range: NSRange(location: 0, length: question.count)).count > 0
        } catch {
            assert(false, "Invalid regex syntax")
        }
    }