Finding the recurring pattern

Question

Let\'s say I have a number with a recurring pattern, i.e. there exists a string of digits that repeat themselves in order to make the number in question. For example, such a

Answer 1

One way to find a recurring pattern and number of times repeated is to use this pattern:

(.+?)(?=\1+$|$)  

w/ g option.
It will return the repeated pattern and number of matches (times repeated)
Non-repeated patterns (fails) will return only "1" match
Repeated patterns will return 2 or more matches (number of times repeated).
Demo