在正则表达式替换字符串中转义美元符号

Question

I have a function in which I need to replace "byte" with "$ball". This doesn't seem to work correctly. Here is the program snippet.

fun main() {

    str := []byte("$apple in a byte
")
    strReplace := "$ball"

    re := regexp.MustCompile("byte")

    final := re.ReplaceAll(str, []byte(strReplace))

    ioutil.WriteFile("testfile.txt", final, 0744)
}

Expected Output in testfile.txt: $apple in a $ball

Actual Output in testfile.txt: $apple in a

Any solutions for successfully getting the desired output?

Answer 1

You use $$ which is exactly what the documentation tells you.

The godoc section for ReplaceAll (https://godoc.org/regexp#Regexp.ReplaceAll) tells you:

$ signs are interpreted as in Expand

So reading the section for Expand has the answer. https://godoc.org/regexp#Regexp.Expand

Please throughly read all relevant documentation for the package and functions you are using before posting a question.