1 files changed, 38 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/named-groups/duplicate-names-match.js b/js/src/tests/test262/built-ins/RegExp/named-groups/duplicate-names-match.js
new file mode 100644
index 0000000000..dee2d62455
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/named-groups/duplicate-names-match.js
@@ -0,0 +1,38 @@
+// |reftest| skip -- regexp-duplicate-named-groups is not supported
+// Copyright 2022 Kevin Gibbons. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Matching behavior with duplicate named capture groups
+esid: prod-GroupSpecifier
+features: [regexp-duplicate-named-groups]
+includes: [compareArray.js]
+---*/
+
+assert.compareArray("bab".match(/(?<x>a)|(?<x>b)/), ["b", undefined, "b"]);
+assert.compareArray("bab".match(/(?<x>b)|(?<x>a)/), ["b", "b", undefined]);
+
+assert.compareArray("aa".match(/(?:(?<x>a)|(?<x>b))\k<x>/), ["aa", "a", undefined]);
+assert.compareArray("bb".match(/(?:(?<x>a)|(?<x>b))\k<x>/), ["bb", undefined, "b"]);
+
+let matchResult = "aabb".match(/(?:(?:(?<x>a)|(?<x>b))\k<x>){2}/);
+assert.compareArray(matchResult, ["aabb", undefined, "b"]);
+assert.sameValue(matchResult.groups.x, "b");
+
+assert.sameValue("abab".match(/(?:(?:(?<x>a)|(?<x>b))\k<x>){2}/), null);
+
+assert.sameValue("abab".match(/(?:(?<x>a)|(?<x>b))\k<x>/), null);
+
+assert.sameValue("cdef".match(/(?:(?<x>a)|(?<x>b))\k<x>/), null);
+
+assert.compareArray("xx".match(/^(?:(?<a>x)|(?<a>y)|z)\k<a>$/), ["xx", "x", undefined]);
+assert.compareArray("z".match(/^(?:(?<a>x)|(?<a>y)|z)\k<a>$/), ["z", undefined, undefined]);
+assert.sameValue("zz".match(/^(?:(?<a>x)|(?<a>y)|z)\k<a>$/), null);
+assert.compareArray("zy".match(/(?<a>x)|(?:zy\k<a>)/), ["zy", undefined]);
+
+assert.compareArray("xz".match(/^(?:(?<a>x)|(?<a>y)|z){2}\k<a>$/), ["xz", undefined, undefined]);
+assert.compareArray("yz".match(/^(?:(?<a>x)|(?<a>y)|z){2}\k<a>$/), ["yz", undefined, undefined]);
+assert.sameValue("xzx".match(/^(?:(?<a>x)|(?<a>y)|z){2}\k<a>$/), null);
+assert.sameValue("yzy".match(/^(?:(?<a>x)|(?<a>y)|z){2}\k<a>$/), null);
+
+reportCompare(0, 0);