import Foundation
let pattern = #"""
(?(DEFINE)
(?<Collection>
(?:(?&GameTree)(?:\s*(?&GameTree))*)?
)
(?<GameTree>
\(\s*
(?&RootNode)\s*
(?&NodeSequence)\s*
(?:(?&Tail)(?:\s*(?&Tail))*)?\s*
\)
)
(?<Tail>
\(\s*
(?&NodeSequence)\s*
(?:(?&Tail)(?:\s*(?&Tail))*)?\s*
\)
)
(?<NodeSequence>
(?:(?&Node)(?:\s*(?&Node))*)?
)
(?<RootNode> (?&Node) )
(?<Node> ;\s*(?:(?&Property)(?:\s*(?&Property))*)? )
(?<Property>
(?&PropIdent)\s*
(?&PropValue)(?:\s*(?&PropValue))*
)
(?<PropIdent> [A-Z](?:\s*[A-Z])* )
(?<PropValue> \[ (?&Value) \])
(?<Value> (?:\\\]|[^\]])* )
)
(?&Property)
"""#
let regex = try! NSRegularExpression(pattern: pattern, options: .allowCommentsAndWhitespace)
let testString = #"GM[1]FF[4]CA[UTF-8]AP[Sabaki:0.52.2]KM[6.5]SZ[19]DT[2023-12-25]"#
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