How to get the intermediate portion of string?

Question

I have a string as under

var input= "dbo.xyx.v1.UserDefinedFunction";

The desired output will be "xyx.v1";

My attempt is

var input = "dbo.xyx.v1.UserDefinedFunction";
var intermediate = input.Split('.').Skip(1);
var res = intermediate.Reverse().Skip(1).Aggregate((a, b) => b + "." + a);

works fine..but any other proper and elegant method?

Kindly note that it can be any part(in the example I just showed 4 parts)

e.g. Input : "dbo.part1.part2.part3.part4.UserDefinedFunction" Output : "part1.part2.part3.part4"

If there are more parts, what would be the desired output? – keyboardP Apr 25 '13 at 10:41 — keyboardP, Apr 25 '13 at 10:41
updated the question...only the inermediate parts – priyanka.sarkar Apr 25 '13 at 10:42 — priyanka.sarkar, Apr 25 '13 at 10:42

Tim Schmelter · Answer 1 · 2013-04-25T10:52:14.720

2

This returns always the mid part of a string which can be one or two parts(acc. to the total part-number).

var input = "dbo.xyx.v1.UserDefinedFunction";
string[] tokens = input.Split('.');
int midIndex = (tokens.Length - 1) / 2;
IEnumerable<int> midIndices = midIndex % 2 == 0
    ? new[] { midIndex }
    : new[] { midIndex, midIndex + 1 };
string mid  = string.Join(".", tokens.Where((t, i) => midIndices.Contains(i)));

Demo

So in this case it returns xyx.v1, for a string bo.xyx.v1 it returns v1 since that's the only mid-part.

edited Apr 25 '13 at 10:52

answered Apr 25 '13 at 10:45

Tim Schmelter

450,073
74
686
939

1

@RoeeGavirel: Ah, i haven't seen his edit. So he wants the part without the first and last and not the mid-part. – Tim Schmelter Apr 25 '13 at 10:56
1

I leave the answer, maybe someone else is looking for the mid-part of a string ;) – Tim Schmelter Apr 25 '13 at 10:59

Sergey Kalinichenko · Answer 2 · 2013-04-25T10:55:30.857

1

If you need to use LINQ, you can use Skip(1).Take(2) and string.Join, like this:

var parts = input.Split('.');
var res = string.Join(".", parts.Skip(1).Take(parts.Length-2));

If you need to throw away the first and the last parts, then you can use Substring, like this:

var start = input.IndexOf('.')+1;
var end = input.LastIndexOf('.')-1;
var res = input.Substring(start, end-start+1);

Finally, you can use regular expression, like this:

var res = Regex.Replace(input, "^[^.]+[.](.+)[.][^.]+$", "$1");

edited Apr 25 '13 at 10:55

answered Apr 25 '13 at 10:38

Sergey Kalinichenko

714,442
84
1,110
1,523

Kindly note that it can be any part(in the example I just showed 4 parts) – priyanka.sarkar Apr 25 '13 at 10:40
@priyanka.sarkar This implementation does not care how many parts there are in the original: it takes items #2 and #3, and ignores all the rest of them. – Sergey Kalinichenko Apr 25 '13 at 10:42

Victor Mukherjee · Accepted Answer · 2013-04-25T10:47:58.357

1

   string output= input.Substring(input.IndexOf('.') + 1, 
                  input.LastIndexOf('.') - input.IndexOf('.') - 1);

edited Apr 25 '13 at 10:47

answered Apr 25 '13 at 10:41

Victor Mukherjee

10,487
16
54
97

output is :xyx.v1.U but not xyx.v1 – priyanka.sarkar Apr 25 '13 at 10:45
2

I think the second `+1` should be changed to `-1`. Anyway, +1 for an efficient solution. – Henrik Apr 25 '13 at 10:47
@priyanka yes, last +1 would be -1. Actually copied that portion from the first argument. – Victor Mukherjee Apr 25 '13 at 10:48
It could be +1 if it was closed like that: `(input.IndexOf('.') + 1)` BUT anyway you are calculating `input.IndexOf('.')` twice for no reason... and what of cases of only 1 or 0 '.' in the string? – Roee Gavirel Apr 25 '13 at 10:49
I thought OP wants the mid part and not the second until last part. – Tim Schmelter Apr 25 '13 at 10:50

score 1 · Answer 4 · answered Apr 25 '13 at 10:46

1

var input = "dbo.xyx.v1.UserDefinedFunction";
var start = input.IndexOf('.');
var end = input.LastIndexOf('.');
string output;
if (start < end)
{
    output = input.Substring(start+1, end-start-1);
}
else
{
    output = input;
}

answered Apr 25 '13 at 10:46

Roee Gavirel

18,955
12
67
94

Hossein Narimani Rad · Answer 5 · 2013-04-25T10:44:13.690

0

var input = "dbo.xyx.v1.UserDefinedFunction";
var intermediate = input.Split('.');
var res = string.Join(".", intermediate[1],intermediate[2]);

EDIT: for any part version

var res = string.Join(".", intermediate.Skip(1).Take(intermediate.Length - 2));

edited Apr 25 '13 at 10:44

answered Apr 25 '13 at 10:38

Hossein Narimani Rad

31,361
18
86
116

Kindly note that it can be any part(in the example I just showed 4 parts) – priyanka.sarkar Apr 25 '13 at 10:39
@priyanka.sarkar can you make example what exactly you mean? – Hossein Narimani Rad Apr 25 '13 at 10:40
updated the question... it should be all intermediate parts(i.e. leaving the first and last part) – priyanka.sarkar Apr 25 '13 at 10:43

score 0 · Answer 6 · answered Apr 25 '13 at 10:39

0

var input = "dbo.xyx.v1.UserDefinedFunction";
var res = string.Join(".", input.Split('.').Skip(1).Take(2));

answered Apr 25 '13 at 10:39

Darin Dimitrov

1,023,142
271
3,287
2,928

Kindly note that it can be any part(in the example I just showed 4 parts) – priyanka.sarkar Apr 25 '13 at 10:40
1

Kindly note that you can adapt the arguments passed to the `Skip` and `Take` functions to match your requirements. They can even be variables. – Darin Dimitrov Apr 25 '13 at 10:42
@DarinDimitrov Please, help me look at http://stackoverflow.com/questions/16200309/error-message-model-not-picking-language-specific-resource-file Culture setting is not being applied to my viewModel. Thanks – codingbiz Apr 25 '13 at 12:05

score 0 · Answer 7 · answered Apr 25 '13 at 10:42

0

You could simplify it and do:

var split = input.Split(".");
var result = String.Join(".", split[1], split[2]);

No need for Skip or Take.

answered Apr 25 '13 at 10:42

Darren

68,902
24
138
144

score 0 · Answer 8 · answered Apr 25 '13 at 10:44

[TestClass]
public class UnitTest2
{
    [TestMethod]
    public void TestMethod1()
    {

        var ret = "this.is.my.test.string".MySplit(".", new int[] {0,1,4 });//this.is.string

    }
}

public static class Process {
    public static string MySplit(this string Source, string seprator, int[] positionTokeep) {
        var items = Source.Split(seprator.ToCharArray());
        string ret = string.Empty;
        for (int i = 0; i < positionTokeep.Length; i++) {
            ret += items[positionTokeep[i]] + seprator;
        }
        if (!string.IsNullOrWhiteSpace(ret)) {
            ret = ret.Substring(0,ret.Length - seprator.Length);
        }
        return ret;
    }
}

How to get the intermediate portion of string?

8 Answers8