Swift method to check for a valid email address (uses Apples data detector instead of a regex)

String+Email.swift

import Foundation

extension String {
	
	mutating func isValidEmail() -> Bool {
		
		guard !self.lowercased().hasPrefix("mailto:") else { return false }
		
		guard let emailDetector = try? NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue) else { return false }
		
		let textRange = NSRange(location: 0, length: self.characters.count)
		let matches = emailDetector.matches(in: self, options: .anchored, range: textRange)
		
		guard matches.count == 1 else { return false }
		
		return matches[0].url?.scheme == "mailto"
	}
}