[docs] A suggestion re page "6.2. re"

[Maksym Nikulyak]

Hi,

On the 3.6.1 documentation's "6.2. re — Regular expression operations"
page, you might want to mention that, in fact, an

{m,n}?

regex is equivalent to a simpler

{m}

one.

Best regards, and great Thank you,
mx
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