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Phone number validation using regex.
Has to start with a 1-4 digit number: ^+?(?([0-9]{1,4}))? Optionally has a 2 digit number after: ([-. ]?([0-9]{2}))? Has to have a 3 digit number: ([-. ]?([0-9]{3})) Has to have a 2-3 digit number: ([-. ]?([0-9]{2,3})) Has to have a 2-4 digit number: ([-. ]?([0-9]{2,4}))$
Regex tests and explanation: regexr.com/6gg6i
Source for common phone number sequences: https://en.wikipedia.org/wiki/Telephone_numbers_in_Ukraine