Filter out unexpected process logs on iOS with better regex matching. (flutter#175452)

This PR modifies the pattern matching on what logs to ignore from
`devicectl`. Basically any log that starts with a timestamp/process
prefix should be ignored unless it has the Flutter engine FML syntax or
is prefixed with `flutter:`. See comment in code for examples.

Fixes flutter#175438.

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Author: vashworth

packages/flutter_tools/lib/src/ios/core_devices.dart

@@ -311,10 +311,27 @@ class IOSCoreDeviceControl {
 
   /// A list of log patterns to ignore.
   static final _ignorePatterns = <Pattern>[
-    RegExp(r'\[PreviewsAgentExecutorLibrary\].*'),
-    RegExp(r'\[UIKit App Config\].*'),
-    RegExp(r'\[UIFocus\].*'),
+    // Ignore process logs that don't contain Flutter or user logs.
+    // Example:
+    //   * Ignore logs with prefix in brackets that doesn't match FML:
+    //     2025-09-16 12:15:47.939171-0500 Runner[1230:133819] [UIKit App Config] ...
+    //   * Ignore logs with timestamp/process prefix:
+    //     2025-09-16 12:15:47.939171-0500 Runner[1230:133819] CoreText note: ...
+    //   * Don't ignore FML logs:
+    //     2025-09-16 12:05:54.162621-0500 Runner[1215:129795] [FATAL:flutter/runtime/service_protocol.cc(121)] ...
+    //   * Don't ignore logs with no timestamp/process prefix:
+    //     A log with no prefix (NSLog, print in Swift, and FlutterLogger)
+    //   * Don't ignore flutter logs:
+    //     2025-09-16 12:50:07.953318-0500 Runner[1279:149305] flutter: ...
+    RegExp(
+      r'^\S* \S* \S*\[[0-9:]*] ((?!(\[INFO|\[WARNING|\[ERROR|\[IMPORTANT|\[FATAL):))(?!(flutter:)).*',
+    ),
+    // Ignore iOS execution mode and potential error. This is not meaningful to the developer.
+    // Example:
+    //   * Dart execution mode: JIT
+    //   * Dart execution mode: simulator
     RegExp(r'Dart execution mode: .*'),
+    'Failed to execute code (error: EXC_BAD_ACCESS, debugger assist: not detected)',
   ];
 
   /// Executes `devicectl` command to get list of devices. The command will

packages/flutter_tools/test/general.shard/ios/core_devices_test.dart

@@ -1881,8 +1881,11 @@ Waiting for the application to terminate...
 This log happens before the application is launched and should not be sent to FakeIOSCoreDeviceLogForwarder
 Launched application with com.example.my_app bundle identifier.
 Waiting for the application to terminate...
-[PreviewsAgentExecutorLibrary] This log happens after the application is launched but matches an ignore pattern and should be skipped
+2025-09-16 12:15:47.939171-0500 Runner[1230:133819] [PreviewsAgentExecutorLibrary] This log happens after the application is launched but matches an ignore pattern and should be skipped
+2025-09-16 12:15:47.939171-0500 Runner[1230:133819] This log happens after the application is launched but matches an ignore pattern and should be skipped
 This log happens after the application is launched and should be sent to FakeIOSCoreDeviceLogForwarder
+2025-09-16 12:15:47.939171-0500 Runner[1230:133819] flutter: This log happens after the application is launched and should be sent to FakeIOSCoreDeviceLogForwarder
+2025-09-16 12:15:47.939171-0500 Runner[1230:133819] [INFO:flutter/runtime/service_protocol.cc(121)] This log happens after the application is launched and should be sent to FakeIOSCoreDeviceLogForwarder
 ''',
           ),
         );
@@ -1896,12 +1899,14 @@ This log happens after the application is launched and should be sent to FakeIOS
 
         expect(fakeProcessManager, hasNoRemainingExpectations);
         expect(logger.errorText, isEmpty);
-        expect(logForwarder.logs.length, 1);
+        expect(logForwarder.logs.length, 3);
         expect(
           logForwarder.logs,
-          contains(
+          containsAll([
             'This log happens after the application is launched and should be sent to FakeIOSCoreDeviceLogForwarder',
-          ),
+            '2025-09-16 12:15:47.939171-0500 Runner[1230:133819] flutter: This log happens after the application is launched and should be sent to FakeIOSCoreDeviceLogForwarder',
+            '2025-09-16 12:15:47.939171-0500 Runner[1230:133819] [INFO:flutter/runtime/service_protocol.cc(121)] This log happens after the application is launched and should be sent to FakeIOSCoreDeviceLogForwarder',
+          ]),
         );
         expect(
           logger.traceText,
@@ -1912,7 +1917,8 @@ This log happens after the application is launched and should be sent to FakeIOS
 This log happens before the application is launched and should not be sent to FakeIOSCoreDeviceLogForwarder
 Launched application with com.example.my_app bundle identifier.
 Waiting for the application to terminate...
-[PreviewsAgentExecutorLibrary] This log happens after the application is launched but matches an ignore pattern and should be skipped
+2025-09-16 12:15:47.939171-0500 Runner[1230:133819] [PreviewsAgentExecutorLibrary] This log happens after the application is launched but matches an ignore pattern and should be skipped
+2025-09-16 12:15:47.939171-0500 Runner[1230:133819] This log happens after the application is launched but matches an ignore pattern and should be skipped
 '''),
         );
         expect(result, isTrue);