repeat the A-Z pattern in the group for the regular expression.
data="HELLO,THERE,WORLD"
pattern=r"([a-zA-Z]+)"
matches=re.findall(pattern,data)
print(matches)
data="HELLO,THERE,WORLD"
pattern=r"([a-zA-Z]+)"
matches=re.findall(pattern,data)
print(matches)
output
['HELLO', 'THERE', 'WORLD']
['HELLO', 'THERE', 'WORLD']