.NET(C#)字符串操作之--将非数字和字母用正则表达式替换为横线

#region 将非数字和字母换为横线
    /// <summary>
    /// 将非数字和字母换为横线
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string TransStringToLine(string str)
    {
      if (str.Trim().Length <= 0)
      {
        return str;
      }
      var s = Regex.Replace(str, @"[^0-9a-zA-Z]+", "-", RegexOptions.IgnoreCase).Trim();
      return s;
    }
	#endregion