How to use

closure

method

in

java.util.regex.Pattern

 Exception in thread "main" java.util.regex.PatternSyntaxException: Illegal repetition
{date:\d}
  at java.util.regex.Pattern.error(Pattern.java:1713)
  at java.util.regex.Pattern.closure(Pattern.java:2775)

Node node = closure(head);
if (node == head) { // No closure
  root = tail;

Node node = closure(head);
if (node == head) { // No closure
  root = tail;

node = closure(node);

node = closure(node);