import Foundation
let pattern = #"^(/dev/[\S]+|zroot\S*?) on (/.*) \(([a-zA-Z0-9]+), .+, (.+)\)$"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
ZFS filesystem
zroot on / (zfs, local, nfsv4acls)
zroot/tmp on /tmp (zfs, local, nosuid, nfsv4acls)
zroot/usr on /usr (zfs, local, nfsv4acls)
zroot/usr/home on /usr/home (zfs, local, nfsv4acls)
zroot/usr/home/vagrant on /usr/home/vagrant (zfs, local, nfsv4acls)
zroot/usr/ports on /usr/ports (zfs, local, nosuid, nfsv4acls)
zroot/usr/ports/distfiles on /usr/ports/distfiles (zfs, local, noexec, nosuid, nfsv4acls)
zroot/usr/ports/packages on /usr/ports/packages (zfs, local, noexec, nosuid, nfsv4acls)
zroot/usr/src on /usr/src (zfs, local, noexec, nosuid, nfsv4acls)
zroot/var on /var (zfs, local, nfsv4acls)
zroot/var/crash on /var/crash (zfs, local, noexec, nosuid, nfsv4acls)
zroot/var/db on /var/db (zfs, local, noexec, nosuid, nfsv4acls)
zroot/var/db/pkg on /var/db/pkg (zfs, local, nosuid, nfsv4acls)
zroot/var/empty on /var/empty (zfs, local, noexec, nosuid, read-only, nfsv4acls)
zroot/var/log on /var/log (zfs, local, noexec, nosuid, nfsv4acls)
zroot/var/mail on /var/mail (zfs, local, noexec, nosuid, nfsv4acls)
zroot/var/run on /var/run (zfs, local, noexec, nosuid, nfsv4acls)
zroot/var/tmp on /var/tmp (zfs, local, nosuid, nfsv4acls)
Non ZFS filesystem
/dev/mfid0p2 on / (ufs, local, journaled soft-updates)
"""#
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