import Foundation
let pattern = #"(numberPinyin":\s*".*)(v)(.*)""#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
['{"russian": "женщина", "english": "woman, v","numberPinyin": "nv3","typeOfChar":"character","typeOfTranslating":"original"}',
'{"chinese": "弯竖左钩", "russian": "вогнутая с крюком влево", "english": "concave with left hook","numberPinyin": "eav","typeOfChar":"stroke","typeOfTranslating":"byStrokes"}',
'{"chinese": "弯竖右钩", "russian": "вогнутая с крюком вправо", "english": "concave with right hook","numberPinyin": "vm2","typeOfChar":"stroke","typeOfTranslating":"byStrokes"}']
"""#
let stringRange = NSRange(location: 0, length: testString.utf16.count)
let substitutionString = #"\1ü\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