How do i find and replace something inside a quote? - go

Question

I found this Go program which is going to find and remove text in a file and I need some help.
How do I modify this program to get the following and replace it?
I tried a couple of things but the issue is there is another quote inside of the string.
Current:
{"telephone_numbers":["1-
Future:
{"telephone_numbers":["+1-
Find and replace script.
package main
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
)
func visit(path string, fi os.FileInfo, err error) error {
if err != nil {
return err
}
if !!fi.IsDir() {
return nil //
}
matched, err := filepath.Match("*.txt", fi.Name())
if err != nil {
panic(err)
return err
}
if matched {
read, err := ioutil.ReadFile(path)
if err != nil {
panic(err)
}
//fmt.Println(string(read))
fmt.Println(path)
newContents := strings.Replace(string(read), "old", "new", -1)
fmt.Println(newContents)
err = ioutil.WriteFile(path, []byte(newContents), 0)
if err != nil {
panic(err)
}
}
return nil
}
func main() {
err := filepath.Walk(".", visit)
if err != nil {
panic(err)
}
}

Answer 1

This is the answer.
package main
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
)
func visit(path string, fi os.FileInfo, err error) error {
if err != nil {
return err
}
if !!fi.IsDir() {
return nil //
}
matched, err := filepath.Match("*.txt", fi.Name())
if err != nil {
panic(err)
return err
}
if matched {
read, err := ioutil.ReadFile(path)
if err != nil {
panic(err)
}
//fmt.Println(string(read))
fmt.Println(path)
newContents := strings.Replace(string(read), `{"telephone_numbers":["1-`, `{"telephone_numbers":["+1-`, -1)
fmt.Println(newContents)
err = ioutil.WriteFile(path, []byte(newContents), 0)
if err != nil {
panic(err)
}
}
return nil
}
func main() {
err := filepath.Walk(".", visit)
if err != nil {
panic(err)
}
}