1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/named-groups/lookbehind.js b/js/src/tests/test262/built-ins/RegExp/named-groups/lookbehind.js
new file mode 100644
index 0000000000..470ff342cd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/named-groups/lookbehind.js
@@ -0,0 +1,47 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Named groups can be used in conjunction with lookbehind
+esid: prod-GroupSpecifier
+features: [regexp-named-groups, regexp-lookbehind]
+includes: [compareArray.js]
+---*/
+
+// Unicode mode
+assert.compareArray(["f", "c"], "abcdef".match(/(?<=(?<a>\w){3})f/u));
+assert.sameValue("c", "abcdef".match(/(?<=(?<a>\w){3})f/u).groups.a);
+assert.sameValue("b", "abcdef".match(/(?<=(?<a>\w){4})f/u).groups.a);
+assert.sameValue("a", "abcdef".match(/(?<=(?<a>\w)+)f/u).groups.a);
+assert.sameValue(null, "abcdef".match(/(?<=(?<a>\w){6})f/u));
+
+assert.compareArray(["f", ""], "abcdef".match(/((?<=\w{3}))f/u));
+assert.compareArray(["f", ""], "abcdef".match(/(?<a>(?<=\w{3}))f/u));
+
+assert.compareArray(["f", undefined], "abcdef".match(/(?<!(?<a>\d){3})f/u));
+assert.sameValue(null, "abcdef".match(/(?<!(?<a>\D){3})f/u));
+
+assert.compareArray(["f", undefined], "abcdef".match(/(?<!(?<a>\D){3})f|f/u));
+assert.compareArray(["f", undefined], "abcdef".match(/(?<a>(?<!\D{3}))f|f/u));
+
+// Non-Unicode mode
+assert.compareArray(["f", "c"], "abcdef".match(/(?<=(?<a>\w){3})f/));
+assert.sameValue("c", "abcdef".match(/(?<=(?<a>\w){3})f/).groups.a);
+assert.sameValue("b", "abcdef".match(/(?<=(?<a>\w){4})f/).groups.a);
+assert.sameValue("a", "abcdef".match(/(?<=(?<a>\w)+)f/).groups.a);
+assert.sameValue(null, "abcdef".match(/(?<=(?<a>\w){6})f/));
+
+assert.compareArray(["f", ""], "abcdef".match(/((?<=\w{3}))f/));
+assert.compareArray(["f", ""], "abcdef".match(/(?<a>(?<=\w{3}))f/));
+
+assert.compareArray(["f", undefined], "abcdef".match(/(?<!(?<a>\d){3})f/));
+assert.sameValue(null, "abcdef".match(/(?<!(?<a>\D){3})f/));
+
+assert.compareArray(["f", undefined], "abcdef".match(/(?<!(?<a>\D){3})f|f/));
+assert.compareArray(["f", undefined], "abcdef".match(/(?<a>(?<!\D{3}))f|f/));
+
+// Even within a lookbehind, properties are created in left to right order
+assert.compareArray(["fst", "snd"], Object.getOwnPropertyNames(
+    /(?<=(?<fst>.)|(?<snd>.))/u.exec("abcd").groups));
+
+reportCompare(0, 0);