using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
if (Regex.IsMatch("da/this-will-validate-correct-1", @"^da/[a-z0-9-]+$"))
Console.WriteLine("Valid!");
else
Console.WriteLine("Invalid!");
}
}
dXNpbmcgU3lzdGVtOwp1c2luZyBTeXN0ZW0uVGV4dC5SZWd1bGFyRXhwcmVzc2lvbnM7CnB1YmxpYyBjbGFzcyBUZXN0CnsKCXB1YmxpYyBzdGF0aWMgdm9pZCBNYWluKCkKCXsKCQlpZiAoUmVnZXguSXNNYXRjaCgiZGEvdGhpcy13aWxsLXZhbGlkYXRlLWNvcnJlY3QtMSIsIEAiXmRhL1thLXowLTktXSskIikpCgkJCUNvbnNvbGUuV3JpdGVMaW5lKCJWYWxpZCEiKTsKCQllbHNlCgkJCUNvbnNvbGUuV3JpdGVMaW5lKCJJbnZhbGlkISIpOwoJfQp9