How Can I Use the Runes Package to Remove Accents From Strings in Go?

Runes Package in Go: Transforming Accented Characters

In Go, a common task is to transform accented characters into their non-accented equivalents. One approach involves using unicode packages such as norm and text. However, these packages can be complex for beginners.

A simpler solution is to use the runes package, which was introduced in Go 1.5 (released in August 2015) and Go 1.6 (slated for release in Q1 2016). The runes package provides a more straightforward way to remove non-spacing marks (Mn), which are typically responsible for accents.

Here's an example of how to use the runes package to remove accents from a string:

<code class="go">import (
    "fmt"
    "runes"
    "bytes"
    "code.google.com/p/go.text/transform"
    "code.google.com/p/go.text/unicode/norm"
)

func main() {
    r := bytes.NewBufferString("Your Śtring")
    t := transform.Chain(norm.NFD, runes.Remove(runes.In(unicode.Mn)), norm.NFC)
    r = transform.NewReader(r, t)
    fmt.Println(r)

    // Output:
    // Your String
}</code>

This code uses the transform.Chain function to apply a series of transformations to the string. First, the string is decomposed into its Unicode normalization form (NFD) to separate the base characters from the accents. Then, the runes.Remove function is applied to filter out any runes that fall within the Mn (nonspacing marks) category. Finally, the string is composed back to its normalized form (NFC) to remove any remaining diacritical marks.

As a result, the accented string "Your Śtring" is transformed into "Your String" after the removal of non-spacing marks.

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