[JS] I need help understanding this code.

I need help on specifically /(?<=\$\(CustomRank{Rank-Name: ).+?(?=}\))/g I don't know what it is and how I can edit it to something different but with similar function.

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That's regex. You can use regexr to parse it to explain it to you.

It will return what is in bold: (**CDT**)

First, it checks if there is a $(CustomRank{Rank-Name:. Then, it will match whatever is inside the curly braces. That's it!