How to format a String arg time to milliseconds?

I was wondering how I can convert an arg of '1h2m3s' to milliseconds (or nanoseconds, whichever is less server stressful).

If a player uses '/flyban 1h' or '/flyban 1d2h3m12s' I need the loop/code to extract the numbers, and differentiate between the times. Then it returns the milliseconds it equals.

Java 8 has a super easy way to do this, but I don't think most servers run Java 8 yet.

Thanks

I've updated the title to more appropriately address the issue I have.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Colby l https://forums.bukkit.org/threads/util-timeparser.171578

 

Colby l You don't need Java 8, you can use regular expressions.
You can use this code to grab the days from the argument;

Code:java

int days = 0;
Pattern getDays = Pattern.compile("(\\n*)d");
Matcher dayMatch = getDays.matcher(args[0]);
if (dayMatch.find())
    days = Integer.parseInt(dayMatch.getGroup(1));

Simply repeat for each of hours, minutes and seconds.