Migrate more tests from blink repository.

test/webkit/fast/regex/non-capturing-backtracking.js

Index: test/webkit/fast/regex/non-capturing-backtracking.js
diff --git a/test/webkit/declaration-in-block.js b/test/webkit/fast/regex/non-capturing-backtracking.js
similarity index 90%
copy from test/webkit/declaration-in-block.js
copy to test/webkit/fast/regex/non-capturing-backtracking.js
index 39c4fc06ce7958ba0d4c2f77e9faede8d67370d3..e086dc7d6d19b57faaf9d47b49a119523a727503 100644
--- a/test/webkit/declaration-in-block.js
+++ b/test/webkit/fast/regex/non-capturing-backtracking.js
@@ -22,8 +22,8 @@
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 description(
-"This test checks that declarations in an if block can be seen outside it."
+"This page tests for proper backtracking with greedy quantifiers and non-capturing parentheses."
 );
 
-if (0) { var b; }
-var a = b;
+var re = /(?:a*)a/;
+shouldBe("re.exec('a')", "['a']");