Fix test status.

tests/corelib_2/corelib_2.status

 # Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # All static_tests have expected compile-time errors.
 [ $strong && $compiler != dart2analyzer && $compiler != dartdevc ]
 core_runtime_types_static_test: MissingCompileTimeError
 splay_tree_test/01: MissingCompileTimeError
 splay_tree_test/02: MissingCompileTimeError
 string_base_vm_static_test: MissingCompileTimeError
@@ skipping 181 matching lines @@
 symbol_reserved_word_test/10: MissingCompileTimeError # Issue 11669, 19972
 
 [ $compiler == dart2js ]
 hash_set_test/01: RuntimeError # Issue 11551
 string_static_test: MissingCompileTimeError
 
 [ ($compiler == none || $compiler == precompiler || $compiler == app_jit) && $runtime != drt ]
 symbol_test/02: MissingCompileTimeError # Issue 11669
 symbol_test/03: MissingCompileTimeError # Issue 11669
 
+[ $compiler == dart2js && $runtime == safari ]
+regexp/no-extensions_test: RuntimeError
+regexp/lookahead_test: RuntimeError
+
 [ $runtime == safari || $runtime == safarimobilesim ]
 string_trimlr_test/02: RuntimeError # Uses Unicode 6.2.0 or earlier.
 
 [ $compiler == dart2js && $runtime == chromeOnAndroid ]
 string_trimlr_test/02: RuntimeError # Uses Unicode 6.2.0 or earlier.
 
 [ $compiler == dart2js && $runtime == drt ]
 string_trimlr_test/02: RuntimeError # Uses Unicode 6.2.0 or earlier.
 
 [ $compiler == dart2js && $runtime == safarimobilesim ]
@@ skipping 285 matching lines @@
 splay_tree_from_iterable_test: RuntimeError
 
 [ $compiler == precompiler && $runtime == dart_precompiled && !$checked ]
 splay_tree_from_iterable_test: RuntimeError
 
 [ $runtime == vm || $runtime == dart_precompiled || $runtime == flutter ]
 rexexp/pcre_test: Pass, Slow, Timeout
 
 [ $mode == debug ]
 regexp/pcre_test: Pass, Slow # Issue 22008