Go (RE2)

Slug (Unicode Letters Allowed) in GO

Validate URL slugs allowing Unicode letters (`café-rénové`), as supported by Next.js i18n routing.

Try it in the GO tester →

Pattern

regexGO
^[\p{L}\p{N}]+(?:-[\p{L}\p{N}]+)*$   (flags: u)

Go (RE2) code

goGo
package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`^[\p{L}\p{N}]+(?:-[\p{L}\p{N}]+)*$`)
	input := `hello-world`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}

Uses `regexp.MustCompile` (panics on bad patterns at startup) and `FindAllString` for all matches.

How the pattern works

[\p{L}\p{N}]+ matches one or more Unicode letters or numbers (so `café` and `東京` are valid). (?:-[\p{L}\p{N}]+)* allows additional hyphen-separated segments. The u flag is REQUIRED in JavaScript for \p{} property escapes; Python's stdlib `re` doesn't support \p{} (use \w with Unicode flag, or the `regex` package); Go RE2 has its own \p{...} support.

Examples

Input

hello-world

Matches

  • hello-world

Input

café-rénové

Matches

  • café-rénové

Input

trailing-

No match

—

Same pattern, other engines

JavaScript / ECMAScript

Supported

See how this pattern looks (and behaves) in JavaScript's built-in RegExp.

Python (re)

See workaround

See how this pattern looks (and behaves) in Python's stdlib `re` module.

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