c# 正则表达式 首字母转大写

    class Program
    {
        static void Main(string[] args)
        {
            // Input strings.
            const string s1 = "samuel allen";
            const string s2 = "dot net perls";
            const string s3 = "Uppercase first letters of all words in the string.";

            // Write output strings.
            Console.WriteLine(TextTools.UpperFirst(s1));
            Console.WriteLine(TextTools.UpperFirst(s2));
            Console.WriteLine(TextTools.UpperFirst(s3));
            Console.ReadKey();
        }
    }

    public static class TextTools
    {
        /// <summary>
        /// Uppercase first letters of all words in the string.
        /// </summary>
        public static string UpperFirst(string s)
        {
            return Regex.Replace(s, @"[a-z]w+", delegate(Match match)
            {
                string v = match.ToString();
                return char.ToUpper(v[0]) + v.Substring(1);
            });
        }
    }