You can help expand this article with text translated from the corresponding article in Spanish. (January 2020) Click [show] for important translation instructions. View a machine-translated version of the Spanish article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Spanish Wikipedia article at [[:es:Acción Regional Extremeña]]; see its history for attribution. You may also add the template {{Translated|es|Acción Regional Extremeña}} to the talk page. For more guidance, see Wikipedia:Translation.

The Extremaduran Regional Action (Spanish: Acción Regional Extremeña; AREX) was a Spanish political party founded on 7 November 1976 as the first regionalist party in Extremadura.^[1][2] Enrique Sánchez de León was the party's secretary-general from 26 March 1977.^[3] AREX joined the Union of the Democratic Centre (UCD) electoral alliance ahead of the 1977 Spanish general election,^[4][5] gaining 4 seats in the Congress of Deputies.^[6] The party would be eventually merged into the UCD upon the party's constitution as a unitary party.^[7]