1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/lookBehind/do-not-backtrack.js b/js/src/tests/test262/built-ins/RegExp/lookBehind/do-not-backtrack.js
new file mode 100644
index 0000000000..ee44a50ea6
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+++ b/js/src/tests/test262/built-ins/RegExp/lookBehind/do-not-backtrack.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-assertion
+description: Do not backtrack into a lookbehind.
+info: |
+  The production Assertion :: (?<=Disjunction) evaluates as follows:
+    1. Evaluate Disjunction with -1 as its direction argument to obtain a Matcher m.
+    2. Return an internal Matcher closure that takes two arguments, a State x and a Continuation
+        c, and performs the following steps:
+      a. Let d be a Continuation that always returns its State argument as a successful MatchResult.
+      b. Call m(x, d) and let r be its result.
+      c. If r is failure, return failure.
+      d. Let y be r's State.
+      e. Let cap be y's captures List.
+      f. Let xe be x's endIndex.
+      g. Let z be the State (xe, cap).
+      h. Call c(z) and return its result.
+features: [regexp-lookbehind]
+---*/
+
+// The lookbehind captures "abc" so that \1 does not match. We do not backtrack
+// to capture only "bc" in the lookbehind.
+assert.sameValue("abcdbc".match(/(?<=([abc]+)).\1/), null);
+
+reportCompare(0, 0);