import java.util.regex.*;
 
class Demo {
    public static void main(String[] args) {
        String myString =
            "text KEYWORD1 text KEYWORD1 text KEYWORD2 text KEYWORD2";
        Pattern pattern = Pattern.compile("KEYWORD1((.(?!KEYWORD1))+?)KEYWORD2");
        Matcher matcher = pattern.matcher(myString);
        String word = "";
        if (matcher.find())
            word = matcher.group(1);
        System.out.println(word);
    }
}

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