Question: What is the official language of the place where Regensberg was a family of counts from?

Context paragraphs:
Official Language Act (Quebec): The Official Language Act of 1974 (French "Loi sur la langue officielle"), also known as Bill 22, was an act of the National Assembly of Quebec, commissioned by Premier Robert Bourassa, which made French the sole official language of Quebec, Canada.  Provincial desire for the Official Language Act came after the repeal of Bill 63.  It was ultimately supplanted by the Charter of the French Language (also known as Bill 101) in 1977, which imposed French as the only language for advertising and education (with many exceptions).

Minority languages of Denmark: Danish language is the official language in Denmark.  On the Faroe Islands Faroese language is the official language while both Faroese and Danish must be taught in schools.  Danish should be used in court, but Faroese can be used in all other official places.  Greenlandic language is the official language on Greenland and Greenland's Home Rule Act of 2009 does not require Danish to be taught or the use of Danish for official purposes.  In accordance with Denmark's official monolingualism all official documents and communications are in Danish.

Official language: An official language is a language that is given a special legal status in a particular country, state, or other jurisdiction.  Typically a country's official language refers to the language used within government (e.g., courts, parliament, administration).  Since "the means of expression of a people cannot be changed by any law", the term "official language" does not typically refer to the language used by a people or country, but by its government.

English language in Puerto Rico: English, along with Spanish, is an official language of the Government of Puerto Rico.  Spanish has been an official language in Puerto Rico since it was colonized in the 15th century.  English, on the other hand, was first introduced as an official language when the United States occupied the island during the Spanish–American War.  Since then, the Puerto Rican government has declared English an official language on several occasions while removing it from that status on as many occasions.

Latvian State Language Center: Latvian State Language Centre (VVC; Latvian: "Valsts valodas centrs" ) is a direct administration institution subordinated to the Minister of Justice of the Republic of Latvia.  The purpose of the State Language Centre is to implement the national policy on the use of the official language.  The Centre supervises and controls the conformity with laws and regulations on the use of official language, provides the State administration institutions and the public with official translations of laws and regulations and other documents issued by the State or international organisations while concurrently ensuring use of consistent terminology.  The State Language Centre protects rights and interests of the official language users, promotes the regularisation of the cultural environment of language and promotes comprehensive functioning of Latvian language.

Chinese as a foreign language: Chinese as a foreign or second language is the study of the Chinese varieties by non-native speakers.  Increased interest in China from those outside has led to a corresponding interest in the study of Standard Chinese ("Mandarin") as a foreign language, the official language of mainland China and Taiwan.  However, the teaching of Chinese both within and outside China is not a recent phenomenon.  Westerners began learning different Chinese varieties in the 16th century.  Within China, Mandarin became the official language in the early 20th century.  Mandarin also became the official language of Taiwan when the Kuomintang took over control from Japan after World War II.

Regensberg family: Regensberg was a family of counts from the Canton of Zürich in Switzerland.  The family had possessions in the medieval Zürichgau from the probably mid-11th century and became extinct in 1331 AD.  With the extinction of the male line, the city republic of Zürich laid claim to the Regensberg lands and formed the "Herrschaft Regensberg" respectively "Äussere Vogtei".

Bihari languages: Bihari is the western group of Eastern Indo-Aryan languages, spoken in Bihar, Uttar Pradesh and neighboring states in India.  Angika, Awadhi, Bajjika, Bhojpuri, Magahi, and Maithili are spoken in Nepal as well.  The Angika, Awadhi, Bajjika, Bhojpuri, Magahi and Maithili speaking population form more than 21% of Nepalese population.  Despite the large number of speakers of these languages, they have not been constitutionally recognised in India, except Maithili, which gained constitutional status via the 92nd amendment to the Constitution of India, of 2003 (gaining assent in 2004).  Even in Bihar, Hindi is the language used for educational and official matters.  These languages were legally absorbed under the overarching label Hindi in the 1961 Census.  Such state and national politics are creating conditions for language endangerments.  After independence Hindi was given the sole official status through the Bihar Official Language Act, 1950.  Hindi was displaced as the sole official language of Bihar in 1981, when Urdu was accorded the status of the second official language.  In this struggle between Hindi and Urdu, the claims of widely-spoken native languages of the region—namely, Angika, Maithili, Bhojpuri, and Magahi—were ignored.

Canton of Zürich: The canton of Zürich (German: "Kanton"    ) has a population (as of 31 December 2016 ) of .  The canton is located in the northeast of Switzerland and the city of Zürich is the capital of the canton.  The official language is German.  The local Swiss German dialect called "Züritüütsch" is commonly spoken.  In English the name of the canton is often written without an umlaut.

Languages of Pakistan: Pakistan's national language is Urdu, which, along with English, is also the official language.  In 2015, the government of Pakistan announced plans to make Urdu the sole official language and abolish English as the second official language.  The country is also home to several regional languages, including Punjabi, Saraiki, Pashto, Sindhi, Balochi, Kashmiri, Hindko, Brahui, Shina, Balti, Khowar, Dhatki, Marwari, Wakhi and Burushaski.  From among these, four (Punjabi, Pashto, Sindhi, and Balochi) are provincial languages.

Supporting paragraphs: Regensberg family Canton of Zürich
Answer: German