How to divide up a string according to a recurring number

Here is an example of a piece of literate I want to divide up:

str =      ["1 This is sentence one of verse one, "+ ...
            "2 This is sentence one of verse two. "+ ...
            "3 This is sentence two of verse three; "+ ...
            "1 This is sentence three of verse one? "+ ...
            "2 This is sentence four of verse two, "+ ...
            "3 this is sentence four but verse three!"];

Notice how the numbers start over, this indicates a new chapter started. How can I make a nx1 string where n=chapters. This is what the results should look like:

Help is appreciated. Thanks!

Answer 1

[Sean Combrink]

Answer: https://stackoverflow.com/questions/64180034/matlab-how-to-divide-up-a-string-according-to-a-recurring-number/64183767#64183767