1 files changed, 26 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/named-groups/string-replace-missing.js b/js/src/tests/test262/built-ins/RegExp/named-groups/string-replace-missing.js
new file mode 100644
index 0000000000..defb9e358c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/named-groups/string-replace-missing.js
@@ -0,0 +1,26 @@
+// Copyright 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: If the group doesn't exist, replace with the empty string
+esid: sec-getsubstitution
+features: [regexp-named-groups]
+---*/
+
+let source = "(?<fst>.)(?<snd>.)|(?<thd>x)";
+for (let flags of ["", "u"]) {
+  let re = new RegExp(source, flags);
+  assert.sameValue("cd", "abcd".replace(re, "$<42$1>"));
+  assert.sameValue("cd", "abcd".replace(re, "$<fth>"));
+  assert.sameValue("cd", "abcd".replace(re, "$<$1>"));
+  assert.sameValue("cd", "abcd".replace(re, "$<>"));
+}
+for (let flags of ["g", "gu"]) {
+  let re = new RegExp(source, flags);
+  assert.sameValue("", "abcd".replace(re, "$<42$1>"));
+  assert.sameValue("", "abcd".replace(re, "$<fth>"));
+  assert.sameValue("", "abcd".replace(re, "$<$1>"));
+  assert.sameValue("", "abcd".replace(re, "$<>"));
+}
+
+reportCompare(0, 0);