(?<=#!)(\\w+\\.*\\w+)+ doesn't match #!super.compound.key3

Question

I wrote a simple regexp

String s = "#!key1 #!compound.key2 #!super.compound.key3";
Matcher matcher = Pattern.compile("(?<=#!)(\\w+\\.*\\w+)+").matcher(s);
while (matcher.find()) {
  System.out.println(matcher.group());
}

which results in

ACTUAL

key1
compound.key2
super.compound

and I am wondering why it matches super.compound, but not super.compound.key3 as I expected.

EXPECTED

key1
compound.key2
super.compound.key3

Any improvements to the regexp would be welcomed.

Answer 1

You need to use

(?<=#!)\w+(?:\.\w+)*

See the regex demo and the regex graph:

Java test:

String s = "#!key1 #!compound.key2 #!super.compound.key3";
Matcher matcher = Pattern.compile("(?<=#!)\\w+(?:\\.\\w+)*").matcher(s);
while (matcher.find()) {
    System.out.println(matcher.group());
}
// => [key1, compound.key2, super.compound.key3]