SOS ! send help to understand this to me(Search and Replace)

Hello, campers I able to understand a bit from the HINTS but still, I am not able to solve it by myself(Algo and DB are killing me :sweat:). If anyone could help me to understand this better would be very helpful.

Cheers. :slight_smile:

Challenge: Search and Replace

Link to the challenge:

What is your code so far? What did you try already? Which parts exactly are giving you issues with understanding?

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