Use NSRegularExpression to support below iOS 16

Author: paul1893

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.8
+// swift-tools-version:5.6
 
 import PackageDescription
 
@@ -29,9 +29,6 @@ let package = Package(
         .product(name: "cmark-gfm", package: "swift-cmark"),
         .product(name: "cmark-gfm-extensions", package: "swift-cmark"),
         .product(name: "NetworkImage", package: "NetworkImage"),
-      ],
-      swiftSettings: [
-        .enableUpcomingFeature("BareSlashRegexLiterals"),
       ]
     ),
     .testTarget(

Sources/MarkdownUI/Utility/InlineNode+RawImageData.swift

@@ -22,23 +22,36 @@ extension InlineNode {
 }
 
 extension InlineNode {
-    @available(iOS 16.0, macOS 13.0, tvOS 13.0, watchOS 6.0, *)
     var size: MarkdownImageSize? {
         switch self {
             case .text(let input):
-                let pattern = /{(?:width\s*=\s*(\d+)px\s*)?(?:height\s*=\s*(\d+)px\s*)?(?:width\s*=\s*(\d+)px\s*)?(?:height\s*=\s*(\d+)px\s*)?\}/
+                let pattern = "\\{(?:width\\s*=\\s*(\\d+)px\\s*)?(?:height\\s*=\\s*(\\d+)px\\s*)?(?:width\\s*=\\s*(\\d+)px\\s*)?(?:height\\s*=\\s*(\\d+)px\\s*)?\\}"
 
-                if let match = input.wholeMatch(of: pattern) {
-                    let widthParts = [match.output.1, match.output.3].compactMap { $0 }
-                    let heightParts = [match.output.2, match.output.4].compactMap { $0 }
+                guard let regex = try? NSRegularExpression(pattern: pattern, options: []) else {
+                    return nil
+                }
+
+                let range = NSRange(input.startIndex..<input.endIndex, in: input)
+                guard let match = regex.firstMatch(in: input, options: [], range: range) else {
+                    return nil
+                }
 
-                    let width = widthParts.compactMap { Float(String($0)) }.last
-                    let height = heightParts.compactMap { Float(String($0)) }.last
+                var width: CGFloat?
+                var height: CGFloat?
 
-                    return MarkdownImageSize(width: width.map(CGFloat.init), height: height.map(CGFloat.init))
+                if let widthRange = Range(match.range(at: 1), in: input), let widthValue = Int(input[widthRange]) {
+                    width = CGFloat(widthValue)
+                } else if let widthRange = Range(match.range(at: 3), in: input), let widthValue = Int(input[widthRange]) {
+                    width = CGFloat(widthValue)
                 }
 
-                return nil
+                if let heightRange = Range(match.range(at: 2), in: input), let heightValue = Int(input[heightRange]) {
+                    height = CGFloat(heightValue)
+                } else if let heightRange = Range(match.range(at: 4), in: input), let heightValue = Int(input[heightRange]) {
+                    height = CGFloat(heightValue)
+                }
+
+                return MarkdownImageSize(width: width, height: height)
             default:
                 return nil
         }

Sources/MarkdownUI/Views/Inlines/ImageView.swift

@@ -53,7 +53,7 @@ struct ImageView: View {
 
 extension ImageView {
     init?(_ inlines: [InlineNode]) {
-        if inlines.count == 2, #available(iOS 16.0, macOS 13.0, tvOS 16.0, *), let data = inlines.first?.imageData, let size = inlines.last?.size {
+        if inlines.count == 2, let data = inlines.first?.imageData, let size = inlines.last?.size {
             self.init(data: data, size: size)
         }
         else if inlines.count == 1, let data = inlines.first?.imageData {