用正则表达式截取字符串中的数字

double d = 0;
string str = "hello8023.1314world"; //要截取的字符串
Match m = Regex.Match(str, "\\d+(\\.\\d+){0,1}");
double.TryParse(m.Groups[0].ToString(), out d);
Console.WriteLine(d);
Console.ReadKey();