index-substr.go

package main

import (
	"fmt"
	"strings"
)

func Substr(value string, leni, lenf int) string {

	if len(value) < leni {
		return ""
	}

	lenx := len(value) // max of text
	leny := lenf       // amount of character

	if lenx < lenf { // amount of character
		leny = lenx
	}

	return value[leni:leny]
}

func main() {
	strIndex:="/home/netcatc/diretorio1/x3334343x34334343/testef2/guilherme/f2-guilherme-2/folder1/folder2-rename2"
	final := len(strIndex)-1
	posi := strings.Index(strIndex, "/x3334343x34334343/")
	fmt.Println(Substr(strIndex,posi, final))
}