using System.Text.RegularExpressions;
using System.Collections;
using System.Collections.Generic;
public static void Main()
recipe ABC: Quelle bonne idC)e!
var lines = menu.Split(new[]{'\n'}, StringSplitOptions.RemoveEmptyEntries);
var menuRegex = new Regex(@"^\d+\s+\w+");
foreach(string s in lines)
if (menuRegex.IsMatch(s))