import Foundation
let pattern = #"^interface (\S+)\n?(?:(?: description (.*)| ip address (\S+) (\S+)| .*)\n?)*"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
interface Null0
no ip unreachables
interface Loopback0
ip address 1.1.1.1 255.255.255.255
no ip redirects
no ip proxy-arp
interface GigabitEthernet0/0/0
description BTCM Hello World
bandwidth 22000
ip address 2.2.2.2 255.255.255.252
no ip redirects
no ip unreachables
no ip proxy-arp
interface GigabitEthernet0/0/1
description Interface going to router X
bandwidth 1000000
ip address 3.3.3.3 255.255.255.252
no ip redirects
no ip unreachables
"""#
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