Regex to remove repeated character pattern in a string

I have a string that may have a repeated character pattern, e.g.

'xyzzyxxyzzyxxyzzyx'

I need to write a regex that would replace such string with its smallest repeated pattern:

'xyzzyxxyzzyxxyzzyx' becomes 'xyzzyx',

'abcbaccbaabcbaccbaabcbaccba' becomes 'abcbaccba'

python regex

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