import Foundation
let pattern = #"O\s+(?P<O>\d+\.\d+\.\d+\.\d+.*(?:[\r\n]+[^\S\r\n]+.*)?)"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
Gateway of last resort is not set
10.0.1.0/8 is variably subnetted, 4 subnets, 2 masks
C 10.1.0.0/24 is directly connected, Ethernet1/0
L 10.1.0.1/32 is directly connected, Ethernet0/0
C 10.2.0.0/24 is directly connected, Ethernet0/1
L 19.18.2.1/32 is directly connected, Serial2/1
O 19.18.3.0/20 [110/128] via 19.18.2.2, 00:00:50, Serial1/1
[110/128] via 19.18.1.2, 00:00:50, Serial1/0
O 12.18.3.1/20 [110/128] via 19.18.2.2, 00:00:50, Serial1/1
[110/128] via 19.18.1.2, 00:00:50, Serial1/0
O 12.18.1.0/20 [110/128] via 19.18.2.2, 00:00:50, Serial0/1
[110/128] via 19.18.1.2, 00:00:50, Serial0/0
"""#
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