fix(ios): improve bundle identifier detection and replacement

lib/exceptions.dart

@@ -185,4 +185,9 @@ class _PackageRenameErrors {
     _invalidShortAppNameMessage,
     34,
   );
+
+  static const baseIdentifierNotFound = _PackageRenameException(
+    _baseIdentifierNotFoundMessage,
+    35,
+  );
 }

lib/messages.dart

@@ -209,3 +209,9 @@ const _macOSProjectFileNotFoundMessage = '''
 ║   project.pbxproj not found in `macos/Runner.xcodeproj/`.   ║
 ╚═════════════════════════════════════════════════════════════╝
 ''';
+
+const _baseIdentifierNotFoundMessage = '''
+╔════════════════════════════════════════════════════╗
+║   No bundle identifiers found in project file!!!   ║
+╚════════════════════════════════════════════════════╝
+''';

lib/platforms/ios.dart

@@ -107,34 +107,55 @@ void _setIOSPackageName(dynamic packageName) {
     }
 
     final iosProjectString = iosProjectFile.readAsStringSync();
-    final newBundleIDIOSProjectString = iosProjectString
-        // Replaces old bundle id from
-        // `PRODUCT_BUNDLE_IDENTIFIER = {{BUNDLE_ID}};`
-        .replaceAll(
-          RegExp(
-            r'PRODUCT_BUNDLE_IDENTIFIER = ([A-Za-z0-9.-_]+)(?<!\.RunnerTests);',
-          ),
-          'PRODUCT_BUNDLE_IDENTIFIER = $packageName;',
-        )
-        // Replaces old bundle id from
-        // `PRODUCT_BUNDLE_IDENTIFIER = {{BUNDLE_ID}}.RunnerTests;`
-        .replaceAll(
-          RegExp('PRODUCT_BUNDLE_IDENTIFIER = (.*?).RunnerTests;'),
-          'PRODUCT_BUNDLE_IDENTIFIER = $packageName.RunnerTests;',
-        )
-        // Removes old bundle id from
-        // `PRODUCT_BUNDLE_IDENTIFIER = "{{BUNDLE_ID}}.{{EXTENSION_NAME}}";`
-        .replaceAllMapped(
+
+    // Extract all bundle identifiers, using only allowed characters
+    final bundleIdRegex = RegExp(
+      r'PRODUCT_BUNDLE_IDENTIFIER = "?([A-Za-z0-9.-]+)"?;',
+    );
+
+    final bundleIdentifierMatches = bundleIdRegex
+        .allMatches(iosProjectString)
+        .map((m) => m.group(1)!)
+        .toSet();
+
+    if (bundleIdentifierMatches.isEmpty) {
+      throw _PackageRenameErrors.baseIdentifierNotFound;
+    }
+
+    // Find the base identifier by counting extensions
+    String? baseIdentifier;
+
+    // Build a map of identifier to extension count in a single pass
+    final extensionCountMap = <String, int>{};
+    for (final identifier in bundleIdentifierMatches) {
+      extensionCountMap[identifier] = 0;
+    }
+    for (final other in bundleIdentifierMatches) {
+      for (final identifier in bundleIdentifierMatches) {
+        if (identifier != other && other.startsWith('$identifier.')) {
+          extensionCountMap[identifier] = extensionCountMap[identifier]! + 1;
+        }
+      }
+    }
+    baseIdentifier = extensionCountMap.entries
+        .reduce((a, b) => a.value >= b.value ? a : b)
+        .key;
+
+    // Replace all occurrences
+    final newIosProjectString = iosProjectString.replaceAllMapped(
       RegExp(
-        r'PRODUCT_BUNDLE_IDENTIFIER = "([A-Za-z0-9.-_]+)\.([A-Za-z0-9.-_]+)";',
+        'PRODUCT_BUNDLE_IDENTIFIER = ("?)${RegExp.escape(baseIdentifier)}(\\.[A-Za-z0-9.-]+)?("?);',
       ),
       (match) {
-        final extensionName = match.group(2);
-        return 'PRODUCT_BUNDLE_IDENTIFIER = "$packageName.$extensionName";';
+        final openQuote = match.group(1) ?? '';
+        final extension = match.group(2) ?? '';
+        final closeQuote = match.group(3) ?? '';
+
+        return 'PRODUCT_BUNDLE_IDENTIFIER = $openQuote$packageName$extension$closeQuote;';
       },
     );
 
-    iosProjectFile.writeAsStringSync(newBundleIDIOSProjectString);
+    iosProjectFile.writeAsStringSync(newIosProjectString);
 
     _logger.i('iOS bundle identifier set to: `$packageName` (project.pbxproj)');
   } on _PackageRenameException catch (e) {