import Foundation
let pattern = #"""
^
(?:
\d{1,4}|
\d{4}-|
\d{4}-[01]|
\d{4}-(?:0[1-9]|1[0-2])|
\d{4}-(?:0[1-9]|1[0-2])-|
\d{4}-(?:0[1-9]|1[0-2])-[0-3]|
\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[0-1])|
\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[0-1])\s|
\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[0-1])\s[0-2]|
\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[0-1])\s(?:2[0-3]|[01]\d)|
\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[0-1])\s(?:2[0-3]|[01]\d):|
\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[0-1])\s(?:2[0-3]|[01]\d):[0-5]|
\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[0-1])\s(?:2[0-3]|[01]\d):[0-5]\d|
\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[0-1])\s(?:2[0-3]|[01]\d):[0-5]\d:|
\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[0-1])\s(?:2[0-3]|[01]\d):[0-5]\d:[0-5]|
\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[0-1])\s(?:2[0-3]|[01]\d):[0-5]\d:[0-5]\d
)
$
"""#
let regex = try! NSRegularExpression(pattern: pattern, options: [.anchorsMatchLines, .allowCommentsAndWhitespace])
let testString = #"""
2
-
20
20a
201
2018
2018-
2018-0
2018-02
2018-02-
2018-02-1
2018-02-1@
2018-02-12
2018-02-12
2018-02-12 0
2018-02-12 00
2018@02-12 00:
2018-02-12 00:
2018-02-12 00:5
2018-02-12 00:55
2018-02-12 00:55:
2018-02-12 00:55:2
2018-02-12 00:55:2z
2018-02-12 00:55:22
"""#
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