Break a string into String Array

Question

Is it possible to break the following string into a string array?

"Test string[Page#][TimeDate]that is difficult to break down."

String Array should be

Test string

[Page#]

[TimeDate]

that is difficult to break down.

NOTE The string may or may not contain items with in [].

There is a Set list of items within [] that can be added to the string. For the purposes of this question lets say they are [Page#], [TimeDate], [Time]. The user can also use [] but these items are not to be extracted separately. For example

"Test string[Page#][TimeDate]that is difficult to [break] down."

String Array should be;

Test string

[Page#]

[TimeDate]

that is difficult to [break] down.

Thank you for any assistance.

Answer 1

Check an example that uses Regular Expressions:

string[] items = { "[Page#]", "[TimeDate]", "[Time]" };
string input = "Test string[Page#][TimeDate]that is difficult to [break] down.";

string j = string.Join( "|", items.Select( i => Regex.Escape( i ) ) );
string pattern = $@"(?:(?!{j}).)+|{j}";

string[] result = Regex.Matches( input, pattern ).Cast<Match>( ).Select( m => m.Value ).ToArray( );

(In .NET you can omit the .Cast<Match>( )).