正则表达式入门(c#)

static void Main(string[] args)
{
    string str = "Act game - Uncharted3, act Game - God of war";
    Regex rex = new Regex(@"\bact\b");
    var result = rex.Match(str);
    if (result.Success)
    {
        var tmp = result.Index;
        Console.WriteLine(tmp);
    }
    else
    {
        Console.WriteLine("failure");
    }
    Console.Read();
}

static void Main(string[] args)
{
    string str = "rpg game - Legend of Heroes, act game - Uncharted3, act Game - God of war";
    Regex rex = new Regex(@"\bact\b.*\bUncharted3\b");
    var result = rex.Match(str);
    if (result.Success)
    {
        var tmp = result.Index;
        Console.WriteLine(tmp);
    }
    else
    {
        Console.WriteLine("failure");
    }
    Console.Read();
}

string str = "the xxxx, xxxx, 021-88888888";
Regex rex = new Regex(@"0\d\d-\d\d\d\d\d\d\d\d");
...

string str = "the xxxx, xxxx, 021-88888888";
Regex rex = new Regex(@"0\d{2}-\d{8}");
...