使用C＃匹配字符串中的模式

Question

Let's say my texts are:

New York, NY is where I live.
Boston, MA is where I live.
Kentwood in the Pines, CA is where I live.

How do I extract just "New York", "Boston", "Kentwood in the Pines" .

I can extract State name by pattern @"\\b,\\s(?"<"state">"\\w\\w)\\s\\w+\\s\\w+\\s\\w\\s\\w+"

I am using regular expression but I'm not able to figure out how to extract city names as city names can be more than two words or three.

Answer 1

Just substring from the beginning of the string to the first comma:

var city = input.Substring(0, input.IndexOf(','));

This will work if your format is always [City], [State] is where I live. and [City] never contains a comma.

Answer 2

this is want you need ..

static void Main(string[] args)
    {
        string exp = "New York, NY is where I live. Boston, MA is where I live. Kentwood in the Pines, CA is where I live.";
        string reg = @"[\w\s]*(?=,)";
        var matches = Regex.Matches(exp, reg);
        foreach (Match m in matches)
        {
            Console.WriteLine(m.ToString());
        }

        Console.ReadLine();
    }