Splitting string on multi-character delimeter

Question

string Idstr="ID03I010102010210AEMPD4677EID03I020102020208L8159734ID03I030102030210IPS1406974PT03T010109981815938030202PT03T0201109899488666030201PT03T0301109818159381030203PT03T040112919818159381030201";

string[] stringSeparators = new string[] { "ID03I0" };
string[] result;

result = IdStr.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries);

This is the result:

result[0]=10102010210AEMPD4677E
result[1]=20102020208L8159734
result[3]=30102030210IPS1406974PT03T010109981815938030202PT03T0201109899488666030201PT03T0301109818159381030203PT03T040112919818159381030201

Desired result:

result[0]=ID03I010102010210AEMPD4677E
result[1]=ID03I020102020208L8159734
result[3]=ID03I030102030210IPS1406974PT03T010109981815938030202PT03T0201109899488666030201PT03T0301109818159381030203PT03T040112919818159381030201

As you can see I want to include delimiter ID03I0 to the elements.

NOTE: I know I can include it by hardcoding it. But that's not the way I want to do it.

You could always just append the delimiter to the beginning of all elements.... — komodosp, Mar 11 '15 at 11:16
why not simply adding it to the start of every result-element? — MakePeaceGreatAgain, Mar 11 '15 at 11:17
I can include it by hardcoding it. But thats not the way I want to do it. — SamuraiJack, Mar 11 '15 at 11:18
Also see http://stackoverflow.com/questions/521146/c-sharp-split-string-but-keep-split-chars-separators — komodosp, Mar 11 '15 at 11:18
You don't have to hard-code the value if that's what you mean... — komodosp, Mar 11 '15 at 11:21

MakePeaceGreatAgain · Accepted Answer · 2015-03-11T11:23:58.817

3

result = IdStr.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
    .Select(x => stringSeparators[0] + x).ToArray();

This adds the seperator to the beginning at every element within your array.

EDIT: Unfortunately with this approach you are limited to use just one single delimiter. So if you want to add more you´d use Regex instead.

edited Mar 11 '15 at 11:23

answered Mar 11 '15 at 11:18

MakePeaceGreatAgain

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This is the best approach. There is also the regex one but this should be a lot easier on CPU. – bokibeg Mar 11 '15 at 11:22

score 2 · Answer 2 · edited May 23 '17 at 12:12

Following Regex pattern should work.

string input = "ID03I010102010210AEMPD4677EID03I020102020208L8159734ID03I030102030210IPS1406974PT03T010109981815938030202PT03T0201109899488666030201PT03T0301109818159381030203PT03T040112919818159381030201";  
string delimiter = "ID03I0";//Modify it as you need
string pattern = string.Format("(?<=.)(?={0})", delimiter);
string[] result = Regex.Split(input, pattern);

Online Demo

Adapted from this answer.

Splitting string on multi-character delimeter

2 Answers2