Golang removing all text between two specific strings

Is it possible from go/golang to just delete everything contained in between two strings?
I have a input.txt file which has the following structure:

#start-kiwi
this text
is important
#end-kiwi

#start-banana
this text
needs to be
completely removed
#end-banana

#start-orange
this text
is also important
#end-orange

From go code I am trying to delete everything in between the markers #start-banana and #end-banana (included both) so the desired result would be:

#start-kiwi
this text
is important
#end-kiwi

#start-orange
this text
is also important
#end-orange

I am using go 1.19 and I have already tried these methods:

string.Contains(strings.Replace(input.txt, "#start-banana", "")
string.Contains(strings.Replace(input.txt, "#end-banana", "")

But it seems like it is not working all right. Is there any preferred method of achieving this? RegEx? With strings library?

Thanks in advance.

You can use the index in order to delimit the portion of text that have to be deleted:

package main

import (
	"fmt"
	"strings"
)

func main() {
	data := `
#start-kiwi
this text
is important
#end-kiwi

#start-banana
this text
needs to be
completely removed
#end-banana

#start-orange
this text
is also important
#end-orange`

	start := "#start-banana"
	stop := "#end-banana"
	startIndex := strings.Index(data, start)
	stopIndex := strings.Index(data, stop) + len(stop)
	res := data[:startIndex] + data[stopIndex:]
	res = strings.ReplaceAll(res, "\n\n", "\n")
	fmt.Println(res)
}

The result will be the following:

#start-kiwi
this text
is important
#end-kiwi

#start-orange
this text
is also important
#end-orange

You can also use regular expressions:

package main

import (
	"fmt"
	"regexp"
)

func main() {

	s := removeBetween(text, "#start-banana", "#end-banana[\n\r]?")

	fmt.Println(s)
}

// removeBetween removes all characters (including new lines) between the start and end markers
func removeBetween(str, start, end string) string {

	anyIncludingEndLine := fmt.Sprintf(`%s[\r\n\s\w]*%s`, start, end)

	return regexp.MustCompile(anyIncludingEndLine).ReplaceAllString(str, "")
}

var text = `
#start-kiwi
this text
is important
#end-kiwi

#start-banana
this text
needs to be
completely removed
#end-banana

#start-orange
this text
is also important
#end-orange
`