Slug transforms a raw text (ex: title) into a pretty URL

Slugify.kt

import java.text.Normalizer

/**
 * Extension function
 */
fun String.slugify(): String =
        Normalizer
                .normalize(this, Normalizer.Form.NFD)
                .replace("[^\\w\\s-]".toRegex(), "") // Remove all non-word, non-space or non-dash characters
                .replace('-', ' ') // Replace dashes with spaces
                .trim()              // Trim leading/trailing whitespace (including what used to be leading/trailing dashes)
                .replace("\\s+".toRegex(), "-") // Replace whitespace (including newlines and repetitions) with single dashes
                .toLowerCase() // Lowercase the final results


// example
"How the Chihuahua Crossed the Road".slugify()
// output: "how-the-chihuahua-crossed-the-road"

// encapsulated in an object
object StringUtils{
      fun slugify(input: String): String =
            Normalizer
                    .normalize(input, Normalizer.Form.NFD)
                    .replace("[^\\w\\s-]".toRegex(), "") // Remove all non-word, non-space or non-dash characters
                    .replace('-', ' ') // Replace dashes with spaces
                    .trim()              // Trim leading/trailing whitespace (including what used to be leading/trailing dashes)
                    .replace("\\s+".toRegex(), "-") // Replace whitespace (including newlines and repetitions) with single dashes
                    .toLowerCase() // Lowercase the final results
 
}

StringUtils.slugify("The quick brown Fox jumps over the lazy Dog")
// output: the-quick-brown-fox-jumps-over-the-lazy-dog