How to split a string with a delimiter that can be repeated adjacent without getting empty parts?

Question

How to split a string using a delimiter when the delimiter can be next to each other and the first delimiter should be part of the string?

Eg:

ABC::XYZ:QUI

The split should be:

1) ABC:
2) XYZ
3) QUI

Split(':') does not works.

Answer 1

You may split on the regex pattern :(?!:):

string input = "ABC::XYZ:QUI";
string[] parts = Regex.Split(input, @":(?!:)");
foreach (string part in parts)
{
    Console.WriteLine(part);
}

This prints:

ABC:
XYZ
QUI

The regex here uses a negative lookahead to ensure that we only split/consume on : which is not followed by another :.