From 982a6f18725df63f1456a3a4543debc3dd47a0c0 Mon Sep 17 00:00:00 2001
From: Aditya Kumar <aditya4u164@gmail.com>
Date: Mon, 9 Nov 2026 03:21:31 +0530
Subject: [PATCH 1/2] fix: handle null strings in string replacment functions

---
 .../@stdlib/string/base/replace-after-last/lib/main.js          | 2 +-
 lib/node_modules/@stdlib/string/base/replace-after/lib/main.js  | 2 +-
 .../@stdlib/string/base/replace-before-last/lib/main.js         | 2 +-
 lib/node_modules/@stdlib/string/base/replace-before/lib/main.js | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/node_modules/@stdlib/string/base/replace-after-last/lib/main.js b/lib/node_modules/@stdlib/string/base/replace-after-last/lib/main.js
index a51d1aa044d9..ef4d2126fad3 100644
--- a/lib/node_modules/@stdlib/string/base/replace-after-last/lib/main.js
+++ b/lib/node_modules/@stdlib/string/base/replace-after-last/lib/main.js
@@ -68,7 +68,7 @@ function replaceAfterLast( str, search, replacement, fromIndex ) {
 		}
 	}
 	idx = str.lastIndexOf( search, fromIndex );
-	if ( str === '' || search === '' || replacement === '' || idx < 0 ) {
+	if ( str === '' || search === '' || idx < 0 ) {
 		return str;
 	}
 	return str.substring( 0, idx + search.length ) + replacement;
diff --git a/lib/node_modules/@stdlib/string/base/replace-after/lib/main.js b/lib/node_modules/@stdlib/string/base/replace-after/lib/main.js
index b78bd8239c72..051f49681a5a 100644
--- a/lib/node_modules/@stdlib/string/base/replace-after/lib/main.js
+++ b/lib/node_modules/@stdlib/string/base/replace-after/lib/main.js
@@ -61,7 +61,7 @@ function replaceAfter( str, search, replacement, fromIndex ) {
 		return str;
 	}
 	idx = str.indexOf( search, fromIndex );
-	if ( str === '' || search === '' || replacement === '' || idx < 0 ) {
+	if ( str === '' || search === '' || idx < 0 ) {
 		return str;
 	}
 	return str.substring( 0, idx + search.length ) + replacement;
diff --git a/lib/node_modules/@stdlib/string/base/replace-before-last/lib/main.js b/lib/node_modules/@stdlib/string/base/replace-before-last/lib/main.js
index 8e9eb0998183..2557ec28fffc 100644
--- a/lib/node_modules/@stdlib/string/base/replace-before-last/lib/main.js
+++ b/lib/node_modules/@stdlib/string/base/replace-before-last/lib/main.js
@@ -68,7 +68,7 @@ function replaceBeforeLast( str, search, replacement, fromIndex ) {
 		}
 	}
 	idx = str.lastIndexOf( search, fromIndex );
-	if ( str === '' || search === '' || replacement === '' || idx < 0 ) {
+	if ( str === '' || search === '' || idx < 0 ) {
 		return str;
 	}
 	return replacement + str.substring( idx );
diff --git a/lib/node_modules/@stdlib/string/base/replace-before/lib/main.js b/lib/node_modules/@stdlib/string/base/replace-before/lib/main.js
index 03758630dc93..e8e77c5d6d38 100644
--- a/lib/node_modules/@stdlib/string/base/replace-before/lib/main.js
+++ b/lib/node_modules/@stdlib/string/base/replace-before/lib/main.js
@@ -53,7 +53,7 @@ function replaceBefore( str, search, replacement, fromIndex ) {
 		return str;
 	}
 	idx = str.indexOf( search, fromIndex );
-	if ( str === '' || search === '' || replacement === '' || idx < 0 ) {
+	if ( str === '' || search === '' || idx < 0 ) {
 		return str;
 	}
 	return replacement + str.substring( idx );

From d7068071ff9cb58598fcdb508e05f5b4cc7523f7 Mon Sep 17 00:00:00 2001
From: Aditya Kumar <aditya4u164@gmail.com>
Date: Mon, 9 Nov 2026 03:22:32 +0530
Subject: [PATCH 2/2] chore: add testcases for null strings

---
 .../base/replace-after-last/test/test.js      | 13 +++++++++++++
 .../string/base/replace-after/test/test.js    | 19 +++++++++++++++++++
 .../base/replace-before-last/test/test.js     | 13 +++++++++++++
 .../string/base/replace-before/test/test.js   | 11 +++++++++++
 .../string/replace-before/test/test.js        | 11 +++++++++++
 5 files changed, 67 insertions(+)

diff --git a/lib/node_modules/@stdlib/string/base/replace-after-last/test/test.js b/lib/node_modules/@stdlib/string/base/replace-after-last/test/test.js
index 25a444ec6edb..2dee20acebef 100644
--- a/lib/node_modules/@stdlib/string/base/replace-after-last/test/test.js
+++ b/lib/node_modules/@stdlib/string/base/replace-after-last/test/test.js
@@ -141,3 +141,16 @@ tape( 'the function returns the entire string if the search string is the empty
 
 	t.end();
 });
+
+tape( 'the function replaces the substring after the last occurrence of a search string when replacement is the empty string', function test( t ) {
+	var expected;
+	var actual;
+	var str;
+
+	str = 'beep boop baz';
+	actual = replaceAfterLast( str, 'p', '', str.length );
+	expected = 'beep boop';
+	t.strictEqual( actual, expected, 'returns expected value' );
+
+	t.end();
+});
diff --git a/lib/node_modules/@stdlib/string/base/replace-after/test/test.js b/lib/node_modules/@stdlib/string/base/replace-after/test/test.js
index 4a776e158521..7b62b29a2d4b 100644
--- a/lib/node_modules/@stdlib/string/base/replace-after/test/test.js
+++ b/lib/node_modules/@stdlib/string/base/replace-after/test/test.js
@@ -128,3 +128,22 @@ tape( 'the function returns the entire string if the search string is the empty
 
 	t.end();
 });
+
+tape( 'the function replaces the substring after a search string when replacement is the empty string', function test( t ) {
+	var expected;
+	var actual;
+
+	actual = replaceAfter( 'beep boop', ' ', '', 0 );
+	expected = 'beep ';
+	t.strictEqual( actual, expected, 'returns expected value' );
+
+	actual = replaceAfter( 'beep boop', 'p', '', 0 );
+	expected = 'beep';
+	t.strictEqual( actual, expected, 'returns expected value' );
+
+	actual = replaceAfter( 'Hello World!', 'Hello', '', 0 );
+	expected = 'Hello';
+	t.strictEqual( actual, expected, 'returns expected value' );
+
+	t.end();
+});
diff --git a/lib/node_modules/@stdlib/string/base/replace-before-last/test/test.js b/lib/node_modules/@stdlib/string/base/replace-before-last/test/test.js
index 23857648a2a7..74ad659b8489 100644
--- a/lib/node_modules/@stdlib/string/base/replace-before-last/test/test.js
+++ b/lib/node_modules/@stdlib/string/base/replace-before-last/test/test.js
@@ -141,3 +141,16 @@ tape( 'the function returns the entire string if the search string is the empty
 
 	t.end();
 });
+
+tape( 'the function replaces the substring before the last occurrence of a search string when replacement is the empty string', function test( t ) {
+	var expected;
+	var actual;
+	var str;
+
+	str = 'beep boop baz';
+	actual = replaceBeforeLast( str, 'p', '', str.length );
+	expected = 'p baz';
+	t.strictEqual( actual, expected, 'returns expected value' );
+
+	t.end();
+});
diff --git a/lib/node_modules/@stdlib/string/base/replace-before/test/test.js b/lib/node_modules/@stdlib/string/base/replace-before/test/test.js
index 6e2205dec1dd..c0a6580c3487 100644
--- a/lib/node_modules/@stdlib/string/base/replace-before/test/test.js
+++ b/lib/node_modules/@stdlib/string/base/replace-before/test/test.js
@@ -133,3 +133,14 @@ tape( 'the function returns the entire string if the search string is the empty
 
 	t.end();
 });
+
+tape( 'the function replaces the substring before a search string when replacement is the empty string', function test( t ) {
+	var expected;
+	var actual;
+
+	actual = replaceBefore( 'Hello World!', 'World', '', 0 );
+	expected = 'World!';
+	t.strictEqual( actual, expected, 'returns expected value' );
+
+	t.end();
+});
diff --git a/lib/node_modules/@stdlib/string/replace-before/test/test.js b/lib/node_modules/@stdlib/string/replace-before/test/test.js
index bc46f53562c3..1c605193bd51 100644
--- a/lib/node_modules/@stdlib/string/replace-before/test/test.js
+++ b/lib/node_modules/@stdlib/string/replace-before/test/test.js
@@ -176,3 +176,14 @@ tape( 'the function returns the entire string if the search string is the empty
 
 	t.end();
 });
+
+tape( 'the function replaces the substring before a search string when replacement is the empty string', function test( t ) {
+	var expected;
+	var actual;
+
+	actual = replaceBefore( 'Hello World!', 'World', '' );
+	expected = 'World!';
+	t.strictEqual( actual, expected, 'returns expected value' );
+
+	t.end();
+});