How to retrieve the last X characters from a GoLang string?

Retrieving the Last X Characters in a Golang String

Getting the last few characters of a string is a common task in programming. This article provides detailed instructions on how to accomplish this in Golang.

Using Slice Expressions

Go strings are simply byte arrays, so you can use slice expressions to grab the last X characters. The syntax is:

s[start:end]

To get the last three characters of a string s, you would use the following expression:

s[len(s)-3:]

Unicode Support

If you're working with unicode strings, you can use the same approach, but cast the rune slice to a string using the string() function:

s := []rune("世界世界世界")
last3 := string(s[len(s)-3:])

Examples

For instance, let's say you have the string 12121211122. The last three characters can be retrieved as follows:

s := "12121211122"
last3 := s[len(s)-3:]

In this case, last3 will be "122".

Conclusion

Slice expressions offer a convenient and efficient way to retrieve the last X characters of a Golang string. Whether you're working with byte arrays or unicode strings, these techniques will get the job done.

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