Replace "." with "_" Golang

Question

been doing Go programming on Codewars as a hobby and stumbled upon following task:

The code provided is supposed to replace all the dots. in the specified String with dashes - But it's not working properly. Task: Fix the bug so we can all go home early.

Initial wrong code:

regexp.MustCompile(`.`).ReplaceAllString(str, "-")

Through brute force, i've made it work like this:

regexp.MustCompile(`[.]`).ReplaceAllString(str, "-")

The correct answer is apparently this:

regexp.MustCompile(`\.`).ReplaceAllString(str, "-")

Could someone please explain the logic behind my solution and the right one. Thank you in advance!

Answer 1

Your solution is correct too.

In regex, the dot define a special metacharacter but inside a character class it's a regular dot.

It is possible however to complain about the misleading impression of metacharacter use, so the escaped dot is more clear and easy to understand.