在 C# 中手动拆分字符串

Question

In my code, I am attempting to manipulate a string:

Some text - 04.09.1996 - 40-18

I'd like to split this into three substrings: Some text , 04.09.1996 , and 40-18 .

When I use the Split method with a hyphen as a separator, the return value is an array of four strings: Some text , 04.09.1996 , 40 , and 18 . How can I make this code work as described above?

Answer 1

You should just split with spaces around - :

 .Split(new[] {" - "}, StringSplitOptions.RemoveEmptyEntries);

See C# demo

var res = "Some text - 04.09.1996 - 40-18".Split(new[] {" - "}, StringSplitOptions.RemoveEmptyEntries);
foreach (var s in res)
    Console.WriteLine(s);

Result:

Some text
04.09.1996
40-18

Answer 2

Use this overload of string split to only get 3 parts:

var s = "Some text - 04.09.1996 - 40-18";
var parts = s.Split(new[] { '-' }, 3);

I'm assuming you also want to trim the spaces too:

var parts = s.Split(new[] { '-' }, 3)
    .Select(p => p.Trim());

Answer 3

I would be wary of "-" or " - " appearing in "Some text", as I assume that you are interested in that as a place holder. If you are certain that "Some text" will not contain "-" than the other answers here are good, simple and readable. Otherwise we need to rely on something that we know is constant about the string. It looks to me like the thing that is constant is the last 3 hyphens. So I would try split on "-" and put the last pair back together like

string input = "Some text - 04.09.1996 - 40-18";
string[] foo = input.Split(new[] { " - " }, StringSplitOptions.RemoveEmptyEntries);
int length = foo.Length;
string[] bar = new string[3];

//put "some text" back together
for(int i=0; i< length - 3;i++)
{
   bar[0] += foo[i];
}

bar[1] = foo[length - 3];
bar[2] = foo[length - 2] + "-" + foo[length - 1];

Answer 4

In current case you can use Split with extra space like

string.Split(" - ")

In term of "good practice" can't recommend this solution.

Answer 5

I am replaced character sequence '--------------------' in your string to special character "&" like below. and then split using special character "&"

 string str = "Hello, my- name --------------------  is Philip J. Fry -------------------- and i like cartoons".Replace("--------------------","&");
  string[] ss=str.Split('&');
  string result=ss[0] + "," + ss[1]+ "," +ss[2];

then output string looks like "Hello, my- name, is Philip J. Fry, and i like cartoons"