determine the number of whitespace characters in a string in matlab

To determine the number of whitespace characters in a string in MATLAB, you can use the count function along with the regular expression \s, which matches any whitespace character (space, tab, newline, etc.). Here's an example:

main.m
str = 'Hello    world!';
num_whitespace = count(str, '\s');
disp(num_whitespace); % Output: 4
94 chars
4 lines

In this example, the string str contains 4 whitespace characters (4 spaces between 'Hello' and 'world'). The count function returns the number of times that the regular expression \s appears in the string.

You can use this method to count any type of character or pattern in a string by changing the regular expression.