How to replace matches in regexp?

Question

JavaScript

Everything is in this fiddle. There, my regular expression finds all the variables inserted into the string, and now I need to replace everything that it found with the values ​​of real variables, what is the easiest way to do this? Since in my last question on stackoverflow everyone wrote using the template string, I’ll immediately say that it is necessary for the admin panel to write such expressions there and variables were substituted in them

Answer 1

const replacements = {
  worksAmount: 187,
  reviewsAmount: 666,
};

const newStr = str.replace(/\$\$\[(\w+)\]/g, (m, g1) => replacements[g1] ?? m);