private static PasswordsDatabase ParseInput(string input)
{
var database = new PasswordsDatabase();
var entryRegex = new Regex(@"^(?<min>\d+)-(?<max>\d+) (?<policyCharacter>[a-z]): (?<password>.*)$");
database.AddRange(from entry in input.Split(Environment.NewLine)
select entryRegex.Match(entry)
into match
let min = int.Parse(match.Groups["min"].Value)
let max = int.Parse(match.Groups["max"].Value)
let policyCharacter = match.Groups["policyCharacter"].Value[0]
let password = match.Groups["password"].ToString()
select new PasswordPolicy(min, max, policyCharacter, password));
return(database);
}
public Day2(string input)
{
_database = ParseInput(input);
}