import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class PositiveLookBehindExample {
public static void main(String args[]) throws Exception {
String regex = "(?<=http://)\\S+";
Pattern pattern = Pattern.compile(regex);
String candidate = "The Java2s website can be found at ";
candidate += "http://www.java2java.com. There, ";
candidate += "you can find some Java examples.";
Matcher matcher = pattern.matcher(candidate);
while (matcher.find()) {
String msg = ":" + matcher.group() + ":";
System.out.println(msg);
}
}
}
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