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%% Capture Substrings of Matches Using Ordinal Tokens % Find the names of HTML tags by defining a token within a regular expression. % Tokens are indicated with parentheses, |()|. %% str = '<title>My Title</title><p>Here is some text.</p>'; expression = '<(\w+).*>.*</\1>'; [tokens,matches] = regexp(str,expression,'tokens','match'); %% % The regular expression |<(\w+).*>.*</\1>| specifies this pattern: % % * |<(\w+)| finds an opening angle bracket followed by one or more alphanumeric % or underscore characters. Enclosing |\w+| in parentheses captures the % name of the HTML tag in a token. % * |.*>| finds any number of additional characters, such as HTML attributes, % and a closing angle bracket. % * |</\1>| finds the end tag corresponding to the first token (indicated % by |\1|). The end tag has the form _|</tagname>|_. %% % View the tokens and matching substrings. celldisp(tokens) %% celldisp(matches)