How to get 4 digits from the middle a string in C#

Question

I have a string variable like test10015, i want to get just the 4 digits 1001, what is the best way to do it? i"m working in asp.net c#

All the answers proposed so far assume the digits will be in a certain position within the string, and would break if the string was instead something like `"a1234b"`. Please provide more a specific explanation on *exactly* what kinds of inputs you expect and what output you would like. Also, please show us what you've tried so far. — p.s.w.g, May 08 '14 at 05:14
try this. it will work for you: string s = "test10015"; string newstring = s.Substring(s.Length - 5, 4); Console.WriteLine(newstring); — Running Rabbit, May 08 '14 at 05:24

score 2 · Answer 1 · answered May 08 '14 at 05:11

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With Linq:

var expected = str.Skip(4).Take(4);

Without Linq:

var expected = str.Substring(4,4);

answered May 08 '14 at 05:11

Sriram Sakthivel

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@RobertHarvey As an alternative, not really required. – Sriram Sakthivel May 08 '14 at 05:12

score 0 · Answer 2 · edited May 08 '14 at 05:35

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string input = "test10015";
string result = input.Substring(4, 4);

edited May 08 '14 at 05:35

Vivek Jain

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answered May 08 '14 at 05:10

Sajeetharan

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This is wrong. The first parameter is the position in the original string, which you've set as the first character. – Robert Harvey May 08 '14 at 05:12

score 0 · Answer 3 · answered May 08 '14 at 05:11

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Select the first four digits in your string:

string str = "test10015";
string strNum = new string(str.Where(c => char.IsDigit(c)).Take(4).ToArray());

answered May 08 '14 at 05:11

Amir Popovich

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@RobertHarvey well do you have a solution that isn't Linq? – Ben May 08 '14 at 05:14
Absolutely. Substring() – Robert Harvey May 08 '14 at 05:14
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Well then instead of criticizing everyone else, it maybe more productive if you provided your own solution. – Ben May 08 '14 at 05:16
Or a regular expression. (just for the sake of argument) – p.s.w.g May 08 '14 at 05:16
substring is good for this spec. case.. I guess he wanted something more generic..but that's just a guess.. – Amir Popovich May 08 '14 at 05:16

score 0 · Answer 4 · answered May 08 '14 at 05:11

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You can use String.Substring Method (Int32, Int32). You can subtract 5 from from the length to start from your required index. Make sure the format of string remains the same.

string res = str.Substring(str.Length-5, 4);

answered May 08 '14 at 05:11

Adil

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How to get 4 digits from the middle a string in C#

4 Answers4