[regexp] correctly parse non-BMP unicode escapes in atoms.

test/mjsunit/harmony/unicode-escapes-in-regexps.js

Index: test/mjsunit/harmony/unicode-escapes-in-regexps.js
diff --git a/test/mjsunit/harmony/unicode-escapes-in-regexps.js b/test/mjsunit/harmony/unicode-escapes-in-regexps.js
index 67493351a4c062bb0beae6fd0b373421cbbb4699..a4c5c5f0f245d46eb8e2303fa5096b884a64c5e5 100644
--- a/test/mjsunit/harmony/unicode-escapes-in-regexps.js
+++ b/test/mjsunit/harmony/unicode-escapes-in-regexps.js
@@ -210,3 +210,40 @@ function testRegexpHelper(r) {
   helper(/foo/u);
   helper(new RegExp("foo", "u"));
 })();
+
+// Non-BMP patterns.
+// Single character atom.
+assertTrue(new RegExp("\u{12345}", "u").test("\u{12345}"));
+assertTrue(/\u{12345}/u.test("\u{12345}"));
+assertTrue(new RegExp("\u{12345}", "u").test("\ud808\udf45"));
+assertTrue(/\u{12345}/u.test("\ud808\udf45"));
+assertFalse(new RegExp("\u{12345}", "u").test("\udf45"));
+assertFalse(/\u{12345}/u.test("\udf45"));
+
+// Multi-character atom.
+assertTrue(new RegExp("\u{12345}\u{23456}", "u").test("a\u{12345}\u{23456}b"));
+assertTrue(/\u{12345}\u{23456}/u.test("b\u{12345}\u{23456}c"));
+assertFalse(new RegExp("\u{12345}\u{23456}", "u").test("a\udf45\u{23456}b"));
+assertFalse(/\u{12345}\u{23456}/u.test("b\udf45\u{23456}c"));
+
+// Disjunction.
+assertTrue(new RegExp("\u{12345}(?:\u{23456})", "u").test(
+    "a\u{12345}\u{23456}b"));
+assertTrue(/\u{12345}(?:\u{23456})/u.test("b\u{12345}\u{23456}c"));
+assertFalse(new RegExp("\u{12345}(?:\u{23456})", "u").test(
+    "a\udf45\u{23456}b"));
+assertFalse(/\u{12345}(?:\u{23456})/u.test("b\udf45\u{23456}c"));
+
+// Alternative.
+assertTrue(new RegExp("\u{12345}|\u{23456}", "u").test("a\u{12345}b"));
+assertTrue(/\u{12345}|\u{23456}/u.test("b\u{23456}c"));
+assertFalse(new RegExp("\u{12345}|\u{23456}", "u").test("a\udf45\ud84db"));
+assertFalse(/\u{12345}|\u{23456}/u.test("b\udf45\ud808c"));
+
+// Capture.
+assertTrue(new RegExp("(\u{12345}|\u{23456}).\\1", "u").test(
+    "\u{12345}b\u{12345}"));
+assertTrue(/(\u{12345}|\u{23456}).\1/u.test("\u{12345}b\u{12345}"));
+assertFalse(new RegExp("(\u{12345}|\u{23456}).\\1", "u").test(
+    "\u{12345}b\u{23456}"));
+assertFalse(/(\u{12345}|\u{23456}).\1/u.test("\u{12345}b\u{23456}"));