NetNewsWire/Multiplatform/Shared/String+URLChecker.swift

20 lines
1.0 KiB
Swift

//
// String+URLChecker.swift
// NetNewsWire
//
// Created by Stuart Breckenridge on 3/7/20.
// Copyright © 2020 Ranchero Software. All rights reserved.
//
import Foundation
extension String {
/// Reference: [StackOverflow](https://stackoverflow.com/questions/161738/what-is-the-best-regular-expression-to-check-if-a-string-is-a-valid-url)
var isValidURL: Bool {
let regEx = "^(http|https|feed)\\://([a-zA-Z0-9\\.\\-]+(\\:[a-zA-Z0-9\\.&%\\$\\-]+)*@)*((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])|localhost|([a-zA-Z0-9\\-]+\\.)*[a-zA-Z0-9\\-]+\\.(com|edu|gov|int|mil|net|org|biz|arpa|info|name|pro|aero|coop|museum|[a-zA-Z]{2}))(\\:[0-9]+)*(/($|[a-zA-Z0-9\\.\\,\\?\\'\\\\\\+&%\\$#\\=~_\\-]+))*$"
let predicate = NSPredicate(format:"SELF MATCHES %@", argumentArray:[regEx])
return predicate.evaluate(with: self)
}
}