如何在MATLAB中检索所选文本？

% 假设我们有一个文本字符串
text = 'This is a sample text for demonstration purposes.';

% 检索包含特定单词的文本
word = 'sample';
indices = strfind(text, word);
if ~isempty(indices)
    disp(['The word "', word, '" was found at position(s):']);
    disp(indices);
else
    disp(['The word "', word, '" was not found.']);
end

% 使用正则表达式检索匹配的文本
pattern = 's[a-z]+';
matches = regexp(text, pattern, 'match');
if ~isempty(matches)
    disp('The following matches were found:');
    disp(matches);
else
    disp('No matches were found.');
end