French "old" region mapping per department

oldRegionMapping.php

<?php

return [
    '01' => 'Rhône-Alpes',
    '02' => 'Picardie',
    '03' => 'Auvergne',
    '04' => 'Provence-Alpes-Côte d\'Azur',
    '05' => 'Provence-Alpes-Côte d\'Azur',
    '06' => 'Provence-Alpes-Côte d\'Azur',
    '07' => 'Rhône-Alpes',
    '08' => 'Champagne-Ardenne',
    '09' => 'Midi-Pyrénées',
    '10' => 'Champagne-Ardenne',
    '11' => 'Languedoc-Roussillon',
    '12' => 'Midi-Pyrénées',
    '13' => 'Provence-Alpes-Côte d\'Azur',
    '14' => 'Basse-Normandie',
    '15' => 'Auvergne',
    '16' => 'Poitou-Charentes',
    '17' => 'Poitou-Charentes',
    '18' => 'Centre-Val de Loire',
    '19' => 'Limousin',
    '20' => 'Corse',
    '21' => 'Bourgogne',
    '22' => 'Bretagne',
    '23' => 'Limousin',
    '24' => 'Aquitaine',
    '25' => 'Franche-Comté',
    '26' => 'Rhône-Alpes',
    '27' => 'Haute-Normandie',
    '28' => 'Centre-Val de Loire',
    '29' => 'Bretagne',
    '2A' => 'Corse',
    '2B' => 'Corse',
    '30' => 'Languedoc-Roussillon',
    '31' => 'Midi-Pyrénées',
    '32' => 'Midi-Pyrénées',
    '33' => 'Aquitaine',
    '34' => 'Languedoc-Roussillon',
    '35' => 'Bretagne',
    '36' => 'Centre-Val de Loire',
    '37' => 'Centre-Val de Loire',
    '38' => 'Rhône-Alpes',
    '39' => 'Franche-Comté',
    '40' => 'Aquitaine',
    '41' => 'Centre-Val de Loire',
    '42' => 'Rhône-Alpes',
    '43' => 'Auvergne',
    '44' => 'Pays de la Loire',
    '45' => 'Centre-Val de Loire',
    '46' => 'Midi-Pyrénées',
    '47' => 'Aquitaine',
    '48' => 'Languedoc-Roussillon',
    '49' => 'Pays de la Loire',
    '50' => 'Basse-Normandie',
    '51' => 'Champagne-Ardenne',
    '52' => 'Champagne-Ardenne',
    '53' => 'Pays de la Loire',
    '54' => 'Lorraine',
    '55' => 'Lorraine',
    '56' => 'Bretagne',
    '57' => 'Lorraine',
    '58' => 'Bourgogne',
    '59' => 'Nord-Pas-de-Calais',
    '60' => 'Picardie',
    '61' => 'Basse-Normandie',
    '62' => 'Nord-Pas-de-Calais',
    '63' => 'Auvergne',
    '64' => 'Aquitaine',
    '65' => 'Midi-Pyrénées',
    '66' => 'Languedoc-Roussillon',
    '67' => 'Alsace',
    '68' => 'Alsace',
    '69' => 'Rhône-Alpes',
    '70' => 'Franche-Comté',
    '71' => 'Bourgogne',
    '72' => 'Pays de la Loire',
    '73' => 'Rhône-Alpes',
    '74' => 'Rhône-Alpes',
    '75' => 'Île-de-France',
    '76' => 'Haute-Normandie',
    '77' => 'Île-de-France',
    '78' => 'Île-de-France',
    '79' => 'Poitou-Charentes',
    '80' => 'Picardie',
    '81' => 'Midi-Pyrénées',
    '82' => 'Midi-Pyrénées',
    '83' => 'Provence-Alpes-Côte d\'Azur',
    '84' => 'Provence-Alpes-Côte d\'Azur',
    '85' => 'Pays de la Loire',
    '86' => 'Poitou-Charentes',
    '87' => 'Limousin',
    '88' => 'Lorraine',
    '89' => 'Bourgogne',
    '90' => 'Franche-Comté',
    '91' => 'Île-de-France',
    '92' => 'Île-de-France',
    '93' => 'Île-de-France',
    '94' => 'Île-de-France',
    '95' => 'Île-de-France',
    '971' => 'Guadeloupe',
    '972' => 'Martinique',
    '973' => 'Guyane',
    '974' => 'La Réunion',
    '976' => 'Mayotte',
];

Never again!