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

Question

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

Hello World!

What Go code would be able to extract Hel

Answer 1

If the string looks like whatever;START;extract;END;whatever you can use this which will get the string in between:

// GetStringInBetween Returns empty string if no start string found
func GetStringInBetween(str string, start string, end string) (result string) {
    s := strings.Index(str, start)
    if s == -1 {
        return
    }
    s += len(start)
    e := strings.Index(str[s:], end)
    if e == -1 {
        return
    }
    return str[s:e]
}

What happens here is it will find first index of START, adds length of START string and returns all that exists from there until first index of END.