How to Use the unicode and unicode/utf8 Packages

The unicode and unicode/utf8 packages automatically support Unicode 17 in Go, providing functions to validate, count, and classify characters without manual configuration.

The unicode and unicode/utf8 packages are standard library components that automatically use Unicode 17 in Go versions that include this update, requiring no code changes. Use unicode/utf8 functions like Valid to check string validity or RuneCount to count characters correctly.

import "unicode/utf8"

s := "Hello, 世界"
if utf8.ValidString(s) {
    count := utf8.RuneCountInString(s)
    // count is 8
}

The unicode package provides constants and functions for character properties, such as unicode.IsLetter or unicode.IsDigit, which also reflect the latest Unicode standard.

import "unicode"

r := 'A'
if unicode.IsLetter(r) {
    // r is a letter
}

No manual configuration is needed; the upgrade from Unicode 15 to 17 is handled by the Go toolchain and standard library implementation.

These packages help your Go program handle text from any language correctly. The unicode package tells you what kind of character you have (like a letter or number), while unicode/utf8 helps you count and check text safely. Think of it as a built-in translator that ensures your code understands emojis, Chinese characters, and special symbols just as well as English letters.