python - Why is this regular expression not working ({m, n})?

Question

Trying to understand regular expressions and I am on the repetitions part: {m, n}.

I have this code:

>>> p = re.compile('a{1}b{1, 3}')
>>> p.match('ab')
>>> p.match('abbb')

As you can see both the strings are not matching the pattern. Why is this happening?

Answer 1

You shouldn't put a space after the comma, and the {1} is redundant.