If I have a string consisting of words of different lengths separated by spaces, how can return a word in that string given only its starting index?

As an example:

str = 'bat catch convey can cart court CUT ct CAT-scan'; 

...and all I have is my starting index, which is 11; consequently I want to return the word "convey" from this string. How do I proceed?

I find that "extractBetween" forces you to choose either between a start string and an end string, i.e.

newStr = extractBetween(str,startStr,endStr)

or a start position and an end position, i.e.

newStr = extractBetween(str,startPos,endPos)

Many thanks for whatever illumination you can provide.

Answer 1

[Image Analyst]

Here's how I thought of to do it:

str = 'bat catch convey can cart court CUT ct CAT-scan'; 
remainingWords = strsplit(str(11:end)) % Get words starting with index 11.
theWord = remainingWords{1} % Take the first word it found.

[Adoniram]

Awesome! Thank you.

Answer 2

[Walter Roberson]

starting_index = 11;     %given

mask = str == ' ';
starts = strfind([1 mask], [1 0]);
stops = strfind([mask 1], [0 1]);

wordidx = find(starts == starting_index);
if isempty(wordidx)
    error('That starting index is not the beginning of a word')
end

the_word = str(starting_index : stops(wordidx));

[Adoniram]

Wow! Hat tip to you sir. Thank you.