Extract multiple TimeUnits from a String

Question

I am trying to strip every Time Unit of a String, e.g.

The String "4w10d50m39s" would return a TimeUnit of 4 weeks, a TimeUnit of 10 days, a TimeUnit of 50 minutes, and a TimeUnit of 39 seconds.

How can I achieve this?

Context: I need them to sum all the Time unit converted to millis and use it as a time stamp, it will be used inside a Minecraft server, in a command made to add a rank to a user for an specific amount of time, example: /addrank iLalox Vip 4w5d, that would set the expiration date to: System.currentMillis() + timeInMillis.

Answer 1

To extract unit you can use regex

\\d+[wdms]

Demo

Then you can use matcher to extract matches from string and create TimeUnits. There is no Week constant in TimeUnit, so i would present week as amount of weeks * 7 in days.

public static void main(String[] args) {
    String test = new String("4w10d50m39s");
    Pattern pattern = Pattern.compile("\\d+[wdms]");
    Matcher matcher = pattern.matcher(test);

    while(matcher.find()) {
        String unit = matcher.group();
        char timeType = unit.charAt(unit.length() - 1);
        int timeAmount = Integer.parseInt(unit.substring(0, unit.length() - 1));
        if(timeType == 'd') {
            System.out.println(TimeUnit.DAYS.toDays(timeAmount) + " DAYS");
        }

        if(timeType == 'm') {
            System.out.println(TimeUnit.MINUTES.toMinutes(timeAmount) + " MINUTES");
        }

        if(timeType == 's') {
            System.out.println(TimeUnit.SECONDS.toSeconds(timeAmount) + " SECONDS");
        }

        if(timeType == 'w') {
            System.out.println(TimeUnit.DAYS.toDays(timeAmount * 7L) + " DAYS IN WEEK");
        }
    }
}

Output:

28 DAYS IN WEEK
10 DAYS
50 MINUTES
39 SECONDS