使用C＃拆分字符串

Question

I have the following string:

string text = "1. This is first sentence. 2. This is the second sentence. 3. This is the third sentence. 4. This is the fourth sentence."

I want to split it according to 1. 2. 3. and so on:

result[0] == "This is first sentence."
result[1] == "This is the second sentence."
result[2] == "This is the third sentence."
result[3] == "This is the fourth sentence."

Is there any way I can do it C#?

Answer 1

假设你不能在你的句子中遇到这样的模式： X. （一个整数，后跟一个点，后跟一个空格），这应该有效：

String[] result = Regex.Split(text, @"[0-9]+\. ");

Answer 2

is it possible that there will be numbers in the sentence too?

As I do not know you formatting, you already said you cannot do on EOL/New Line I would try something like...

List<string> lines = new List<string>();
string buffer = "";
int count = 1;

foreach(char c in input)
{
   if(c.ToString() == count.ToString())
   {
      if(!string.IsNullOrEmpty(buffer))
      {
         lines.Add(buffer);
         buffer = "";
      }
      count++;
   }
   buffer += c;
}

//lines will now contain your splitted data

You can then access each sentence like this...

string s1 = lines[0];
string s2 = lines[1];
string s3 = lines[2];

Important: Make sure you check the count of lines before getting sentence like...

string s1 = lines.Count > 0 ? lines[0] : "";

This makes a big assumption that you will not have the next lines number ID in a given sentance (ie sentence 2 will not contain the number 3)

If this does not help the provide you input in original format (do not add lines breaks if there are none)

EDIT : Fixed my code (wrong variable sorry)

Answer 3

int index = 1; 
String[] result = Regex.Split(text, @"[0-9]+\. ").Where(i => !string.IsNullOrEmpty(i)).Select(i => (index++).ToString() + ". " + i).ToArray();

result will contain your sentences, including the "line number".

Answer 4

You could split on the '.' char and drop anything smaller than 2 char from the resulting array.

Of course, this relies on the fact that you would have no datapoints of 1 character other than the numeric indicator, if that was the case you could also check for it as a numeric value.

This answer would also drop a period from your sentences, so you'd have to add that back in. There is a lot of manipulation but this saves you from having to read each char and decision it independently.

Answer 5

This is the easiest way:

    var str = "1. This is first sentence." +
              "2. This is the second sentence." +
              "3. This is the third sentence." +
              "n. This is the nenth sentence";
    //set your max number e.g 10000
    var num = Enumerable.Range(1, 10000).Select(x=>x.ToString()+".").ToArray(); 
    var res=str.Split(num ,StringSplitOptions.RemoveEmptyEntries);

Hope this help ;)