import Foundation
let pattern = #"^(?:\+1)?\(?([2-9]{0,1}[0-9]{2})\)?[. -]?([0-9]{3})[.-]?([0-9]{4})$"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
312.876.9354
901-402-3541
(931)123-0953
(615) 561-0783
+17084223141
"""#
let stringRange = NSRange(location: 0, length: testString.utf16.count)
let substitutionString = #"$1 $2 $3"#
let result = regex.stringByReplacingMatches(in: testString, range: stringRange, withTemplate: substitutionString)
print(result)
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Swift 5.2, please visit: https://developer.apple.com/documentation/foundation/nsregularexpression