Go: Retrieve a string from between two characters or other strings

Question

Let's say for example that I have one string, like this:

<h1>Hello World!</h1>

What Go code would be able to extract Hello World! from that string? I'm still relatively new to Go. Any help is greatly appreciated!

Answer 1

I improved the Jan Kardaš`s answer. now you can find string with more than 1 character at the start and end.

func GetStringInBetweenTwoString(str string, startS string, endS string) (result string,found bool) {
    s := strings.Index(str, startS)
    if s == -1 {
        return result,false
    }
    newS := str[s+len(startS):]
    e := strings.Index(newS, endS)
    if e == -1 {
        return result,false
    }
    result = newS[:e]
    return result,true
}

Answer 2

Here is my answer using regex. Not sure why no one suggested this safest approach

package main

import (
    "fmt"
        "regexp"
)

func main() {
    content := "<h1>Hello World!</h1>"
    re := regexp.MustCompile(`<h1>(.*)</h1>`)
    match := re.FindStringSubmatch(content)
    if len(match) > 1 {
        fmt.Println("match found -", match[1])
    } else {
        fmt.Println("match not found")
    }
    
}

Playground - https://play.golang.org/p/Yc61x1cbZOJ

Answer 3

There are lots of ways to split strings in all programming languages.

Since I don't know what you are especially asking for I provide a sample way to get the output you want from your sample.

package main

import "strings"
import "fmt"

func main() {
    initial := "<h1>Hello World!</h1>"

    out := strings.TrimLeft(strings.TrimRight(initial,"</h1>"),"<h1>")
    fmt.Println(out)
}

In the above code you trim <h1> from the left of the string and </h1> from the right.

As I said there are hundreds of ways to split specific strings and this is only a sample to get you started.

Hope it helps, Good luck with Golang :)

DB