Checking phone numbers for equivalence

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What's the best way to check phone numbers in different formats for equivalence?

Different formats:

"(708) 399 7222"

"7083997222"

"708-399-7222"

"708399-7222"

"+1 (708) 399-299"

"+1 (708)399-299"

asked 29 secs ago

A user

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