Pattern compile
import java.util.regex.Matcher; import java.util.regex.Pattern; public class ReluctantExample { public static void main(String args[]) { String regex = "(\\d+?)"; Pattern pattern = Pattern.compile(regex); String candidate = "1234"; Matcher matcher = pattern.matcher(candidate); while (matcher.find()) { System.out.println(matcher.group()); } System.out.println("Done"); } }