Regular Expressions - How can I read the char of a text using the index?

Question

Assuming that, this is a findWord function which searches in a text and returns the indexes that a given word is located. How to read the characters that are located some pos before each index?
Kind regards,
Vag.
public static void findWord(String type) {
        int count = 0;
        String regex = "<a word>";
        String text = readFile("data/raw/" + type + "/" + type + ".page.all.txt");
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(text);
        System.out.print("Word <a word> was found at positions");
        while (matcher.find()) {
            count++;
            System.out.print(", " + matcher.start());
        System.out.println(" at a total of " + count + " times!");
    }

Answer 1

Read the API docs for java.util.regex.Matcher. The matcher object exposes this data via start() and end() methods.