Replace with a regex formula prop has quotation mark issue

Question

On notion i am trying to create a formula. that uses replace inside of a replaceall with a regex im having an issue on putting the prop value inside the double quotes in the replace.

The code in working state;

replaceAll(replace(prop("all chapter numbers"), "(?:[^,]*,){2}", ""), ",.*", "");

What i am trying to accomplish to

replaceAll(replace(prop("all chapter numbers"), "/(?:[^,]*,){prop("total checked chapter")}", ""), ",.*", "")

I have tried to use the template literal instead of the simple quotation. Which resulted on notion formula not recognizing the code and simply telling me " needed.

Because i had no clue about JavaScript and template literal i have did some research and try to replicate from the examples.

Firstly because notion reaplace formula looking much diffrent that what i have seen on javascript sites i tried to do it on one replace then add the other one afterwards.

notion replace

replace("Visit Microsoft","Microsoft","W3Schools");

notion replaceAll

javascript examples i have seen

let text = "Visit Microsoft!";
let result = text.replace("Microsoft", "W3Schools");

implementing onto my issue

Try1:

replace(prop("all chapter numbers")),`(?:[^,]*,)${prop("total checked chapter")}`, ``)

Output syntax error

try1

replace(prop("all chapter numbers"),`(?:[^,]*,){${total checked chapter}}`,"" )

try1.1

I have checked this question

That i have to use new regExp but i got no info on the web how to use a newregex on the syntax of notion replace formula.

from the w3 school example i tried to put my prop/string value with ${}

replace(prop("all chapter numbers"),"(?:[^,]*,){${total checked chapter}}","" )

but in this one it did not saw my value and counted as 0 so the result

if i try to change the "" double quotes like this

replace(prop("all chapter numbers"),`(?:[^,]*,){${total checked chapter}}`,"" )

it will give me the same syntax issue on the other examples like this

i even tried another solution i have seen that uses '\b{replacethis}\b'

replace(prop("all chapter numbers"),`\\b${total checked chapters}\\b` , "")

results regex results