Replace "." with "_" Golang

php editor Youzi today introduces you to a very practical Golang language feature - the replacement operator (_). In Golang, the substitution operator can be used to ignore the value of a variable or expression, making the code more concise and readable. By using substitution operators, we can avoid unnecessary variable assignments or function return value processing, improving code readability and execution efficiency. Next, we will introduce the usage and precautions of the substitution operator in detail to help everyone better understand and apply this practical feature.

Question content

I have been doing go programming on codewars as a hobby and stumbled upon the following tasks:

The code provided should replace all dots. In the specified string with a dash - But it doesn't work properly. Mission: Fix the bug so we can get home early.

Initial error code:

regexp.mustcompile(`.`).replaceallstring(str, "-")

By brute force, I got it to work like this:

regexp.mustcompile(`[.]`).replaceallstring(str, "-")

The correct answer is obviously this:

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

Can someone explain the logic behind my solution and the correct solution? Thank you in advance!

Solution

Your solution is also correct.

In regular expressions, dot defines a special metacharacter , but in character classes it is a regular dot.

However, one can complain about the misleading impression of metacharacter usage, so the escape points are clearer and easier to understand.

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