Regex

Regex.swift

public enum Regex: String {
    case email = "^[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}$"
}

extension Regex: RegexProvider {
    public var regex: String {
        return rawValue
    }
    
    static func validate(expression: String, forRegex regex: Regex) -> Bool {
        return validate(expression: expression, forRegexString: regex.regex)
    }
}

RegexProvider.swift

public protocol RegexProvider {
    var regex: String { get }
}

public extension RegexProvider {
    static func validate(expression: String, forRegex regex: RegexProvider) -> Bool {
        return validate(expression: expression, forRegexString: regex.regex)
    }

    static func validate(expression: String, forRegexString string: String) -> Bool {
        return NSPredicate(format: "SELF MATCHES %@", string).evaluate(with: expression)
    }
}