Locale.php

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<?php

namespace Elgg\I18n;

use Elgg\Exceptions\I18n\InvalidLocaleException;

final class Locale {

    private function __construct(private string $locale) {
    }
    
    public function __toString() {
        return $this->locale;
    }
    
    public static function parse(string $locale): Locale {
        if (!preg_match('~^[a-z0-9_]{2,20}$~', $locale)) {
            throw new InvalidLocaleException("Unrecognized locale: {$locale}");
        }
        
        return new Locale($locale);
    }
}