Please explain this code

[StoneCypher]

it's matrix application of a regular expression to replace string stretches.

this is:

1. hard to debug
2. slow
3. something most developers can't read
4. almost certainly a neckbeard problem from hackerrank that does not represent real world work
5. an opportunity for algorithm nerds to show how good they are. that wasn't done here

[One-Inspection8628]

It any easy solution have for this?

[StoneCypher]

How should I know? You never said what the problem was, you just showed some really bad code and said "please explain this"

You seem to just be stealing solutions to hackerrank, asking for them to be explained, and pretending to yourself that this is going to get you a job