Format all tests.

tests/corelib_strong/regexp/lookahead_test.dart

 // Copyright (c) 2014, the Dart project authors. All rights reserved.
 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
@@ skipping 91 matching lines @@
   testRE(re, "c", true);
   testRE(re, "d", false);
   execRE(re, "a", ["a", "a"]);
   execRE(re, "b", ["b", null]);
   execRE(re, "c", ["c", null]);
 
   execRE(new RegExp(r"^(?=(b))b"), "b", ["b", "b"]);
   execRE(new RegExp(r"^(?:(?=(b))|a)b"), "ab", ["ab", null]);
   execRE(new RegExp(r"^(?:(?=(b)(?:(?=(c))|d))|)bd"), "bd", ["bd", "b", null]);
 
-
-
   // Test of Negative Look-Ahead.
 
   re = new RegExp(r"(?!x).");
   testRE(re, "y", true);
   testRE(re, "x", false);
   execRE(re, "y", ["y"]);
 
   re = new RegExp(r"(?!(\d))|\d");
   testRE(re, "4", true);
   execRE(re, "4", ["4", null]);
   execRE(re, "x", ["", null]);
 
-
   // Test mixed nested look-ahead with captures.
 
   re = new RegExp(r"^(?=(x)(?=(y)))");
   testRE(re, "xy", true);
   testRE(re, "xz", false);
   execRE(re, "xy", ["", "x", "y"]);
 
   re = new RegExp(r"^(?!(x)(?!(y)))");
   testRE(re, "xy", true);
   testRE(re, "xz", false);
@@ skipping 19 matching lines @@
 
   re = new RegExp(r"^(?!(x)(?=(y)(?!(z))))");
   testRE(re, "a", true);
   testRE(re, "xa", true);
   testRE(re, "xyz", true);
   testRE(re, "xya", false);
   execRE(re, "a", ["", null, null, null]);
   execRE(re, "xa", ["", null, null, null]);
   execRE(re, "xyz", ["", null, null, null]);
 }