Java Regex: Sentence Extractor

/*
* Write a program that reads a keyword and some text from the console and prints all sentences from the text, containing that word.
* A sentence is any sequence of words:
*   ending with dot ('.'), exclamation mark ('!') or question mark ('?').
*/


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class SentenceExtractor {
    public static void main(String[] args) {
        String keyword = "";
        String text = "";

        try {
            BufferedReader reader =
                    new BufferedReader(new InputStreamReader(System.in));

            keyword = reader.readLine();
            text = reader.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }

        String patternStr = String.format("\\b[A-Z][^.?!]*?\\b%s\\b.*?[!.?]", keyword);
        Pattern pattern = Pattern.compile(patternStr);
        Matcher matcher = pattern.matcher(text);
        while (matcher.find()) {
            System.out.println(matcher.group());
        }
    }
}