import Foundation
let pattern = #"K'(?|(?P<name1>81)\d+|(61)\d+|(64)\d+|(1)\d+|(44)\d+|(86)\d+|(678)\d+|(41)\d+|(49)\d+|(33)\d+|(685)\d+|(\d{1,3})\d+)"#
let regex = try! NSRegularExpression(pattern: pattern)
let testString = #"""
K'8134567
K'81345678
K'6134516789
K'61345678
K'643456
K'646345678
K'1234567890
K'12345678901
K'1454567890 <<<--- want 145 returned and not 1
K'13345678901 <<<--- want 133 returned and not 1
K'3214567890123
K'32134567890123
K'3654567890123
K'8934567890123
K'6554567890123
I am interested in the digits after K'
I am looking to do this using regex but not sure if it can be done. What I want is:
if the number starts with 81 return 81
if the number starts with 61 return 61
...
if the number starts with something i am not interested in return other(or its first digits of 1-3)
The above criteria works:
but what I also want is:
if the fist digit is 1 then return 1 BUT
if the fist digit is 1 and the 2nd and 3rd digit are 45 return 145 and don't return just 1
if the fist digit is 1 and the 2nd and 3rd digit are 33 return 133 and don't return just 1
I presume I have to put something inside this part of the regex |(1)\d+|
Questions:
Does regex sort the data first?
Is the order of the regex search important to how it is implemented? i deally I do not want this.
"""#
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