import Foundation
// WARNING: You included a flag that Swift doesn't support: U
// When this flag is set, it inverts the "greediness" of the quantifiers so that they are not greedy by default, but become greedy if followed by '?'.
// As an alternative, this effect can also be achieved by setting a (?U) modifier setting within the pattern or by a question mark behind a quantifier (e.g. .*?).
let pattern = #"(<div class="([^"]+)">.+<div class="child-same-class">)"#
let regex = try! NSRegularExpression(pattern: pattern, options: [.caseInsensitive, .dotMatchesLineSeparators])
let testString = #"""
<div class="parent-first-class">
<div class="child-same-class">
<div class="parent-second-class">
<div class="child-same-class">
<div class="parent-third-class">
<div class="child-same-class">
"""#
let stringRange = NSRange(location: 0, length: testString.utf16.count)
let substitutionString = #"$1\n\t<xf:if is="'$2' == 'parent-second-class'>...</xf:if>"#
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