I’m referring to this question. Why can’t capturing groups be part of a conditional expression when specifying a string rather than a function as the replacement?

var strings = ["Chapter_a", "Chapter_1", "Chapter_1a"];
strings.forEach((string) => {
  console.log(string.replace(/(Chapter)_(d+)(w*)/, `$1${"$2" ? " $2." : ""}${"$3" ? " $3)" : ""}`));
});

Expected output:

Chapter a)

Chapter 1.

Chapter 1. a)

Actual output:

Chapter . a)

Chapter 1. )

Chapter 1. a)

Why is this not working as expected?