import Foundation
let pattern = ##"""
(?x-i) # FREE-SPACE MODE, case-sensitive
(?(DEFINE)
(?<ws>[\r\n\t\x20]*)
(?<str>"(?:\\[rntbf\\\/] | [[:xdigit:]]{4} | [^\\"[:cntrl:]])*")
(?<bool>true|false)
(?<nil>nil)
(?<num>-?\d+(?:\.\d+)?)
(?<elem>(?:(?&str)|(?&bool)|(?&nil)|(?&num))(?&ws))
(?<comma>,(?&ws))
)
# JSON Array
\[ (?&ws)
(?:
(?:
(?&elem) | (?R)(?&ws)
)
(?(?=(?&comma)(?:(?&elem)|[\[\{]))(?&comma))
)*
\]
| # Or
# JSON Object
\{ (?&ws)
(?:
(?&str) (?&ws)
: (?&ws)
(?:
(?&elem) | (?R)(?&ws)
)
(?(?=(?&comma)["\[\{])(?&comma))
)*
\}
"""##
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
{"foo":"bar", "bools":true,
"digits":42,
"objects":{ "cool" : "beans"},
"arraystoo":[
{"thisworks":"yep"},
{"thisworkstoo":"uh, huh!!"}
]
}
"""#
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