In this string "13 12", I like to find if there is an occurrence of '3', but I am not interested in char '3' which is part of "13". In other word I am looking for number 3 not 13.
By using the following code in python I always get a match,

match = re.match('3','13 12')

Any help regarding how to find isolated occurrences of characters or sequence of characters will be appreciated.

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>>> print('3' in  '13 12'.split())
>>> print('3' in  '13 12 333 453 2 3 433'.split())

There is also'\b3\b', '13 12 333 453 2 3 433') but it will match -3 too.

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