How to Extract a Substring Between Two Characters or Strings in Go?

Go Code to Extract Substring Between Two Characters or Strings

If you have a string and want to extract a particular substring from within it, Go provides a flexible mechanism to accomplish this.

For instance, consider the following string:

<h1>Hello World!</h1>

Extracting the Substring

To extract "Hello World!" from this string using Go, you can implement the following function:

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

Understanding the Function

This function takes three arguments:

• str: The original string
• start: The start string or character
• end: The end string or character

It works as follows:

1. It finds the first index of start in the original string.
2. It adds the length of start to the starting index, effectively skipping over the start string.
3. It finds the first index of end in the substring starting from the adjusted starting index.
4. It calculates the ending index by adding the adjusted starting index to the found index of end.
5. Finally, it returns the substring from the adjusted starting index to the ending index.

Sample Usage

To use this function, you can pass in the original string, the start string, and the end string. For example:

start := "<h1"
end := "</h1>"
substring := GetStringInBetween("&lt;h1&gt;Hello World!&lt;/h1&gt;", start, end)
// substring will be "Hello World!"

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