Who is the calligrapher who is good at regular script and is known as the best in regular script?

The calligrapher who is good at regular script and is known as the best in regular script is Ouyang Xun.

Ouyang Xun, courtesy name Xinben, was born in Linxiang, Tanzhou (now Changsha, Hunan) in the Tang Dynasty. He was born in the first year of Yongding (557 AD) of Emperor Chen Wu of the Southern Dynasty and died in the 15th year of Zhenguan (641 AD) of Emperor Taizong at the age of 85. From the official to the crown prince, the lv jing order was issued, so later generations also called it "Xinben" or "Lv Jing".

The Biography of Ouyang Xun in the Old Book of the Tang Dynasty records: "Xun started to learn from Wang Xizhi, and then he gradually became more familiar with his style. His writing skills were extremely powerful, and he was a master of his craft for a while. When people got hold of his writings, they regarded him as a regular model." Goryeo valued his books very much and often sent envoys to ask for them...". The evaluation of Ouyang Xun's calligraphy style in the past dynasties is that it is distinguished by its sharp and vigorous style. There are 22 kinds of inscriptions written in his life, as recorded in Zheng Qiao's "Inscriptions on Stone and Stone". The main works in regular script that have been handed down from generation to generation include "Yao Bian's Epitaph", "Jiucheng Palace Liquan Inscription", "Huadu Temple Yong Zen Master's Relic Pagoda Inscription", "Yu Gonggong Wen Yanbo's Monument" and "Huangfu's Birthday Monument", etc. Ouyang Xun's regular script The stele inscriptions are known as the leader of regular script in the Tang Dynasty. Because of his rigorous brushwork and structure, he has always been used as a model for beginners.