import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
class Foo {
    public static void main(String[] args) {
        Matcher m = Pattern.compile(".*(?<=X)").matcher("Foo BarX Baz");
 
        // limit matcher to first chars outside of normal lookahead scope
        m.region(0, 4);
 
        // matcher should still find a match because of transparent bounds
        m.useTransparentBounds(true);
        System.out.println("found=" + m.find());
        System.out.println("result=" + m.group());
    }
}

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