How to convert "\\u0301" to "\u0301"

Question

The problem that I met is that Given a string contains several special substrings like: "\\u0301" "\\b" "\\t",..etc

Please convert all special strings above into "\u0301","\b","\t", ..etc

Note that if just removing a backslash here, you will get a plaintext of "\u0301", instead an accent mark of Unicode.

A one-by-one solution is to replace each special string

str = strings.Replace(str, "\\u0301","\u0301", -1)

Is a general solution to all escape character codes?

Answer 1

If you need to convert a byte sequence that contains escaped Unicode sequences and control sequences to a Unicode string, then you can use strconv.Unquote function.

To do this, convert the bytes to a string, escape the double-quote and newline characters, and add double-quote characters at the beginning and end of this string.

package main

import (
    "fmt"
    "strconv"
    "strings"
)

func main() {
    b := []byte{65, 92, 117, 48, 51, 48, 49, 9, 88, 10, 34, 65, 34}
    // the same as
    // b := []byte("A\\u0301\tX\n\"A\"")

    // convert to string
    s := string(b)

    fmt.Println(s)
    fmt.Println("=========")

    // escape double quotes
    s = strings.ReplaceAll(s, "\"", "\\\"")
    // escape newlines
    s = strings.ReplaceAll(s, "\n", "\\n")

    r, err := strconv.Unquote(`"` + s + `"`)
    if err != nil {
        panic(err)
    }
    fmt.Println(r)
    fmt.Println("=========")
}

Output:

A\u0301 X
"A"
=========
Á  X
"A"
=========

https://go.dev/play/p/WRsNGOT1zLR