import Foundation
let pattern = #"^(?<date>\d{4}_?\d{2}_?\d{2})_(?<meeting_type>\w{2,3})_((?<agenda>[a-z0-9]{1,3})_)?(?<description>.+)?\.pdf$"#
let regex = try! NSRegularExpression(pattern: pattern, options: [.anchorsMatchLines, .caseInsensitive])
let testString = #"""
20200225_RM_agenda.pdf
20200225_RM_2_memo.pdf
20200225_ss1_3c_presenTATION.pdf
20200225_CA_4d_SiGnEd.pdf
20200225_RM_5_Order1234.pdf
2020_02_25_EV_Notice.pdf
"""#
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