Finding a Name for a Function

Suppose you come across some code that a previous employee on your project, long moved on and unavailable, wrote. Their code passes unit tests and integration tests, so it probably does the right thing. But they have not given a useful name or documentation for a certain function:

def is_something(s):
    return not re.match(r'^(.+?)\1+$', s)

For this puzzle, simply provide a good name and a docstring for this function, to be kind to later programmers.

Before you turn the page…

Code is read far more often than it is written.

def repeated_prefix(s):
    """Look for any prefix string in 's' and match only if
    that prefix is repeated at least once, but it might be
    repeated many times.  No other substring may occur
    between the start and end of the string for a match.
    """
    return not re.match(r'^(.+?)\1+$', s)