将“first,middle,middle,last”拆分为包含3个元素的数组(first,middle,last)

时间:2011-12-14 11:54:55

标签: c# regex string split

我想将以下字符串拆分为三个元素:

first, middle, middle, middle, middle, last

结果将是:

splits[0] = "first"
splits[1] = "middle, middle, middle, middle"
splits[2] = "last"

我不知道这是否最好用正则表达式或字符串方法完成。

4 个答案:

答案 0 :(得分:7)

var s = "first, middle, middle, middle, middle, last";
var singleItems = s.Split(',').Select(x => x.Trim());
var splits = new []
             {
                 singleItems.Take(1).Single(),
                 singleItems.Skip(1).Take(singleItems.Count() - 2)
                                    .Aggregate("", (s1, s2) => s1 + s2 + ", ")
                                    .Trim(' ', ','),
                 singleItems.Skip(singleItems.Count() - 1).Single()
             };

另一种方法是:

var firstIndex = s.IndexOf(',');
var lastIndex = s.LastIndexOf(',');
var splits = new []
             {
                 s.Substring(0, firstIndex),
                 s.Substring(firstIndex + 2, lastIndex - (firstIndex + 2)),
                 s.Substring(lastIndex + 2)
             };

我认为第二种解决方案更清晰,更易于理解。但它的缺点是第一个和最后一个逗号必须后跟一个空格。第一个版本不存在此要求。

答案 1 :(得分:1)

这个怎么样

var input = "first, middle, middle, middle, middle, last";


var outputs = input.Split(',').Select(wrd=>wrd.Trim())
                              .GroupBy(wrd=>wrd)
                              .Select(lst => string.Join(", ", lst)).ToArray();

输出[0] =“第一”
  输出[1] =“中,中,中,中”
  输出[2] =“最后”

选择(...修剪())会删除拆分后的前导空格。
GroupBy(...)提供三个列表({“first”},{“middle”,“middle”,“middle”,“middle”},{“last”}
选择(...加入(...))会使用正确的逗号创建最终字符串。

hth,
艾伦。

答案 2 :(得分:0)

  string separator = ", ";
  string input = "first, middle, middle, middle, middle, last";
  int i1 = input.IndexOf(separator);
  int i2 = input.LastIndexOf(separator);
  string[] splits = new string[3];
  splits[0] = input.Substring(0, i1);
  splits[1] = input.Substring(i1 + separator.Length, i2 - i1 - separator.Length);
  splits[2] = input.Substring(i2 + separator.Length);

答案 3 :(得分:0)

string data = "first, middle, middle, middle, middle, last";

string[] splitData = data.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);

Dictionary<string, string> splits = new Dictionary<string, string>();

foreach (var s in splitData)
{
    var temp = s.Trim();
    if (splits.ContainsKey(temp))
    {
        splits[temp] += ", " + temp;
    }
    else
    {
        splits[temp] = temp;
    }
}

string[] result = splits.Select(y => y.Value).ToArray();