Serena

import Foundation public struct Utils { public static func formatDate(_ date: Date) -> String { let formatter = DateFormatter() formatter.dateStyle = .medium return formatter.string(from: date) } public static func calculateArea(radius: Double) -> Double { return Double.pi * radius * radius } } public extension String { func isValidEmail() -> Bool { let emailRegex = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}" return NSPredicate(format: "SELF MATCHES %@", emailRegex).evaluate(with: self) } }