regex: allow p123-p123 and p123-123

ImageViewer/ViewController.swift

@@ -266,7 +266,7 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
     func getMetadataFromFilename(path: URL) {
         // Beautiful, is it not?
         let patterns: [(NSRegularExpression, NSRegularExpression, Int, Int, Int)] = [
-            (try! NSRegularExpression(pattern: #"c([0-9]+(?:x[0-9]+)?) \(v([0-9]+)\) - p([0-9]+(?:-[0-9]+)?)"#), try! NSRegularExpression(pattern: #"^(.*) - c([0-9]+(?:x[0-9]+)?) \(v([0-9]+)\) - p([0-9]+(?:-[0-9]+)?)"#), 3, 1, 2),
+            (try! NSRegularExpression(pattern: #"c([0-9]+(?:x[0-9]+)?) \(v([0-9]+)\) - p([0-9]+(?:-p?[0-9]+)?)"#), try! NSRegularExpression(pattern: #"^(.*) - c([0-9]+(?:x[0-9]+)?) \(v([0-9]+)\) - p([0-9]+(?:-p?[0-9]+)?)"#), 3, 1, 2),
             (try! NSRegularExpression(pattern: "v([0-9]+) p([0-9]+(?:-[0-9]+)?) - c([0-9]+(?:x[0-9]+)?)"), try! NSRegularExpression(pattern: "^(.*) - v([0-9]+) p([0-9]+(?:-[0-9]+)?) - c([0-9]+(?:x[0-9]+)?)"), 2, 3, 1),
         ]
         var pattern: NSRegularExpression! = nil