Decyphering a simple regex

Question

The regular expression in question is

(\\d{3,4}[.-]?)+

sample text

707-7019-789

My progress so far

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Answer 1

The brackets remove the functionality of the dot. Brackets mean "Range"/"Character class". Thus you are saying Choose from the list/range/character class .- You aren't saying choose from the list "anything"- (anything is the regular meaning of .)