import Foundation
let pattern = #"(sudo)(?:\[\d+\])?\:\s+(?:\[[^]]+]\s+)?(\S+)\s*\:\s*TTY=([^ ;]+)\s*;\s*PWD=([^ ;]+)\s*;\s*USER=([^ ;]+)\s*;\s*COMMAND=([^\"]+)"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"{"xif_srcip":"10.0.252.164","sl_fac":"authpriv","sl_sev":"notice","sl_pri":"85","sl_h":"security-alerts-test-1","message":"sudo: root : TTY=pts/4 ; PWD=/root ; USER=root ; COMMAND=/sbin/insmod","ident":"sudo","xif_pfx":"syslog","xif_fwdr":"security-fluentd-iad01-ppd-01.us-east-1a.preprod.ntnxi.net","xif_fwdrip":"10.254.0.6","xih_s":"_","xif_tag":"syslog.authpriv","time":"2019-07-17T20:25:45.700914000Z"}"#
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