whisper | based time-series database format | Time Series Database library

You have tuples, so one option is to explode it:

MySQL 8.0 has a new function REGEXP_REPLACE().

Demo:

I would do it like this:

Just like any other class, you have to put that function in a companion object if you want to call it like that instead of calling it on an instance of the class.

1. You are over-concerned about performance. You could pass ten strings or a hundred copies of short strings like this and it's completely insignificant to performance. Think about when a web page opens on a computer 20 years ago, and thousands of words of text appears on your screen near-instantly. But when you pass a String, it is not copied. Only its memory address is copied, which is even more trivial. Regardless, it is both more efficient and cleaner code to pass the whole thing, not the individual components. Focus primarily on the cleanest-looking code and only try to optimize when you have a performance-critical section of code, like a piece of algorithm that's repeated thousands of times while the user is waiting for the result.

2. You should not use Maps for this. That's the sort of thing you do in weakly-typed languages like JavaScript. Maps are never used in this way in a strongly-typed language. When you have multiple parameters with different meanings, you use a class to represent them. This makes your code robust. The compiler will complain about and red-underline most of your errors before you even have to install your code to test it. With a map, you won't find your errors until after the program is running and you start having weird bugs that you have to go through the debugging process to find. Replace your map with a class like this:

I solved it myself:

It is possible if you can control your home router (NAT router) and be able to set port forwarding to your own computer/device in the internal network. Many home routers have that option. Practically you have to agree with your friends on the ports to use and then let each other know the public IP of your home router.

I said ports because depending on the application/protocol you want to use, you may need more than one (e.g., one for signalling protocol, one for audio stream and one for video stream -- this is common for VoIP with Session Initiation Protocol/SIP). If you want a multi-party mesh conference call, you need more forwarded ports.

You also need to configure your chat application to use the ports where the traffic is forwarded. Some SIP client applications allow that.

Then it is about distribution among the peers of the public IPs for home routers. There is the option for dynamic DNS, where the home router can push the new IP to a dynamic DNS server on every change. This is of course a matter of the home routing having this feature. But this can be considered giving metadata to a 3rd party. Maybe there are applications that can just ping each other periodically and update on retrieving from a different IP, for security, some authentication has to be set in place to be sure the packets come from your trusted friends.

However, if you or your friends are not tech savvy, dealing with all the above can be complex. In such case I would rather rent a cheap cloud virtual machine (VM), there are plenty of options under 10$/month, and run own instance of an open source chat/voice/video conference system, such as Jitsi Meet, Matrix/Element, RocketChat or Mattermost, just to name a few. Many offer Docker images that makes it easy to run and they typically can automatically use Let's Encrypt to get TLS certificate and offer good privacy and secure communication. A domain needs to be purchased as well to make it work easy with web browsers.

A second variant would be to use the cloud VM server to create an encrypted VPN (Virtual Private Network) with some open source solution like OpenVPN or WireGuard. Then every friend will connect to the VPN, you all will be like in a local network and can use any chat app without caring about changing of home router IP.

Use G.nodes instead of G.node.

As I understand it you are trying to identify all possible matches for the jumbled string in your list. You could sort the letters in the jumbled word and match the resulting list against sorted lists of the words in your data file.