From 1d842ceccf86bbeef6beadc1efb8287c4a4518fe Mon Sep 17 00:00:00 2001
From: Alexander Borisov <alexander.borisov@nginx.com>
Date: Tue, 2 Jul 2019 18:14:47 +0300
Subject: [PATCH] Fixed String.prototype.replace() for '$0' replacement string.

For example:
'0'.replace(/^/g, "$0")
---
 njs/njs_string.c         | 2 +-
 njs/test/njs_unit_test.c | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/njs/njs_string.c b/njs/njs_string.c
index ba4358c8..fa60e85c 100644
--- a/njs/njs_string.c
+++ b/njs/njs_string.c
@@ -3470,7 +3470,7 @@ skip:
 
         size = 2;
 
-        if (c >= '0' && c <= '9') {
+        if (c >= '1' && c <= '9') {
             type = c - '0';
 
             if (p < end) {
diff --git a/njs/test/njs_unit_test.c b/njs/test/njs_unit_test.c
index 81db47df..24ecf857 100644
--- a/njs/test/njs_unit_test.c
+++ b/njs/test/njs_unit_test.c
@@ -5566,6 +5566,9 @@ static njs_unit_test_t  njs_test[] =
     { nxt_string("'abc'.replace(/(a*)/g, function v0() {return '124'})"),
       nxt_string("124124b124c124") },
 
+    { nxt_string("typeof '0'.replace(/^/g, '$0')"),
+      nxt_string("string") },
+
     { nxt_string("/]/"),
       nxt_string("/\\]/") },
 
-- 
2.47.3