C#使用正则表达式实现首字母转大写的方法

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, @"\b[a-z]\w+", delegate(Match match)
   {
    string v = match.ToString();
    return char.ToUpper(v[0]) + v.Substring(1);
   });
  }
}