import Foundation
let pattern = #"""
(?(DEFINE)
(?<quote>['"])
(?<pair>
(?>
\w+
|(?:
(?<pairQuote>(?"e))[^'"]+?\k<pairQuote>
)
)
\s*\:
)
(?<string>
(?<stringQuote>(?"e))[\S\s]*?(?<!\\)\k<stringQuote>
)
(?<integer>\-?\d+(?:\.\d+)?(?:e[-+]\d+)?)
(?<scalar>true|false|null|(?&integer))
(?<elements>
\s*(?&value)
(?(R&array)|(?>(?:\s*\,(?&elements))|\s*))
)
(?<array>\[(?>(?&elements)|\s*)\])
(?<value>
(?&object)
|(?&string)
|(?&scalar)
|(?&array)
)
(?<members>
\s*(?&pair)\s*(?&value)
(?(R&object)|(?>(?:\s*\,(?&members))|\s*))
)
(?<object>\{(?&members)?\})
)
\A(?&object)\Z
"""#
let regex = try! NSRegularExpression(pattern: pattern, options: [.anchorsMatchLines, .caseInsensitive, .allowCommentsAndWhitespace])
let testString = #"""
{"menu": {
"header": "SVG Viewer",
"items": [
{"id": "Open"},
{"id": "OpenNew", "label": "Open New"},
null,
{"id": "ZoomIn", "label": "Zoom In"},
{"id": "ZoomOut", "label": "Zoom Out"},
{"id": "OriginalView", "label": "Original View"},
null,
{"id": "Quality"},
{"id": "Pause"},
{"id": "Mute"},
null,
{"id": "Find", "label": "Find..."},
{"id": "FindAgain", "label": "Find Again"},
{"id": "Copy"},
{"id": "CopyAgain", "label": "Copy Again"},
{"id": "CopySVG", "label": "Copy SVG"},
{"id": "ViewSVG", "label": "View SVG"},
{"id": "ViewSource", "label": "View Source"},
{"id": "SaveAs", "label": "Save As"},
null,
{"id": "Help"},
{"id": "About", "label": "About Adobe CVG Viewer..."}
],
"test": [
"Some value",
4,
null,{}
],
"empty_array":[-0.34E+4]
}}
"""#
let stringRange = NSRange(location: 0, length: testString.utf16.count)
let matches = regex.matches(in: testString, range: stringRange)
var result: [[String]] = []
for match in matches {
var groups: [String] = []
for rangeIndex in 1 ..< match.numberOfRanges {
let nsRange = match.range(at: rangeIndex)
guard !NSEqualRanges(nsRange, NSMakeRange(NSNotFound, 0)) else { continue }
let string = (testString as NSString).substring(with: nsRange)
groups.append(string)
}
if !groups.isEmpty {
result.append(groups)
}
}
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