using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
// Validar número 00n-nnnnnn
string valor = "001-000001";
Regex re = new Regex(@"^00[1-9]-[0-9]{6}$");
if (re.IsMatch(valor)) {
Console.WriteLine("Válido");
}
else
{
Console.WriteLine("Error");
}
}
}
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