How to Extract Substrings in Go Using the GetStringInBetween Function?

Extracting Substrings in Go

If you need to extract a specific substring from a string, Go provides the GetStringInBetween function to accomplish this task.

Problem:

You want to extract a particular substring from a string that contains known start and end strings or characters. For instance, given the string "

Hello World!

", you aim to retrieve "Hello World!".

Solution:

Using the GetStringInBetween function, you can easily extract the desired substring. The function takes three arguments:

1. str: The original string from which you want to extract the substring.
2. start: The starting point of the substring within the original string.
3. end: The ending point of the substring within the original string.

Here's the Go code for the GetStringInBetween function:

<code class="go">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
    }
    e += s + e - 1
    return str[s:e]
}</code>

Example Usage:

To demonstrate how the GetStringInBetween function works, consider the following code:

<code class="go">originalString := "<h1>Hello World!</h1>"
substring := GetStringInBetween(originalString, "<h1>", "</h1>")
fmt.Println(substring) // Output: Hello World!</code>

Implementation Details:

The GetStringInBetween function first locates the starting point of the substring within the original string using the strings.Index function. If no starting point is found, the function returns an empty string.

It then adds the length of the starting string to the starting point index to ensure that the substring extraction starts after the starting string.

Next, it searches for the ending point of the substring within the remaining portion of the original string using strings.Index again. If no ending point is found, the function returns an empty string.

Finally, the function adds the starting point and the length of the ending string to the ending point index to extract the desired substring.

This approach allows you to extract substrings from strings easily, especially when you have specific start and end strings or characters.

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