[Swift] - String Regex Match and Email Check

stringRegexMatch.swift

//: Playground - noun: a place where people can play

import Foundation

extension String {

    /// Return all matches substrings from this string using this regex
    ///
    /// - Parameter regex: A string Regex to match
    /// - Returns: array of substrings that matches this regex
    func matches(from regex: String) -> [String] {
        do {
            let regex = try NSRegularExpression(pattern: regex)
            let nsString = self as NSString
            let results = regex.matches(in: self, range: NSRange(location: 0, length: nsString.length))
            return results.map { nsString.substring(with: $0.range)}
        } catch let error {
            print("invalid regex: \(error.localizedDescription)")
            return []
        }
    }
    
    /// Check if this string is an email
    var isAnEmail: Bool {
        return self.matches(from: "^[A-Z0-9a-z._%+-]+\\@[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}$").count == 1
    }
}

let newEmail = "glauber@gmail.com"
print(newEmail.isAnEmail)