import Foundation
let pattern = #"((\D|^)0+(0|[1-9]+))"#
let regex = try! NSRegularExpression(pattern: pattern)
let testString = #"""
0127.00.09.01
107.000.09.01
107.0.70.01
107.9.0.01
23.107.000.09
107.09.0.01
23.0.107.000
23.0.107.00
23.0.0127.01
"""#
let stringRange = NSRange(location: 0, length: testString.utf16.count)
let substitutionString = #"$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