From 33aa33913cd6bb5269f0e5e115cead919013d3a0 Mon Sep 17 00:00:00 2001
From: Awraam <awraam.waskowski@gmail.com>
Date: Mon, 29 Sep 2025 19:31:22 +0200
Subject: [PATCH 1/2] fix: Make `www` case-sensitive when detecting link starts

---
 src/rules.ts                  | 3 ++-
 test/specs/new/autolinks.html | 8 +++++++-
 test/specs/new/autolinks.md   | 8 +++++++-
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/rules.ts b/src/rules.ts
index 67dcb09ece..8818819fdf 100644
--- a/src/rules.ts
+++ b/src/rules.ts
@@ -408,7 +408,8 @@ const inlineGfm: Record<InlineKeys, RegExp> = {
   ...inlineNormal,
   emStrongRDelimAst: emStrongRDelimAstGfm,
   emStrongLDelim: emStrongLDelimGfm,
-  url: edit(/^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/, 'i')
+  url: edit(/^((?:protocol):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/)
+    .replace('protocol', /[fF][tT][pP]|[hH][tT][tT][pP][sS]?/)
     .replace('email', /[A-Za-z0-9._+-]+(@)[a-zA-Z0-9-_]+(?:\.[a-zA-Z0-9-_]*[a-zA-Z0-9])+(?![-_])/)
     .getRegex(),
   _backpedal: /(?:[^?!.,:;*_'"~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_'"~)]+(?!$))+/,
diff --git a/test/specs/new/autolinks.html b/test/specs/new/autolinks.html
index 8fa4837e61..708f800c5e 100644
--- a/test/specs/new/autolinks.html
+++ b/test/specs/new/autolinks.html
@@ -12,4 +12,10 @@
 
 <p><strong><a href="mailto:me@example.com">me@example.com</a></strong></p>
 
-<p><strong><a href="mailto:test@test.com">test@test.com</a></strong></p>
\ No newline at end of file
+<p><strong><a href="mailto:test@test.com">test@test.com</a></strong></p>
+
+<p><a href="http://www.example.com">www.example.com</a></p>
+
+<p>Www.example.com</p>
+
+<p>WWW.example.com</p>
diff --git a/test/specs/new/autolinks.md b/test/specs/new/autolinks.md
index 1f5f739c49..c77620cbff 100644
--- a/test/specs/new/autolinks.md
+++ b/test/specs/new/autolinks.md
@@ -12,4 +12,10 @@ hTtP://fOo.CoM
 
 **me@example.com**
 
-__test@test.com__
\ No newline at end of file
+__test@test.com__
+
+www.example.com
+
+Www.example.com
+
+WWW.example.com

From 7646f3bd1c0c997353bc0fe1e6e8d4db5cf037a8 Mon Sep 17 00:00:00 2001
From: Awraam <awraam.waskowski@gmail.com>
Date: Fri, 3 Oct 2025 17:25:52 +0200
Subject: [PATCH 2/2] fix: Fix case-insensitive `http|ftp` in text

---
 src/rules.ts                  | 4 +++-
 test/specs/new/autolinks.html | 2 ++
 test/specs/new/autolinks.md   | 2 ++
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/rules.ts b/src/rules.ts
index 8818819fdf..e661bee4a3 100644
--- a/src/rules.ts
+++ b/src/rules.ts
@@ -414,7 +414,9 @@ const inlineGfm: Record<InlineKeys, RegExp> = {
     .getRegex(),
   _backpedal: /(?:[^?!.,:;*_'"~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_'"~)]+(?!$))+/,
   del: /^(~~?)(?=[^\s~])((?:\\[\s\S]|[^\\])*?(?:\\[\s\S]|[^\s~\\]))\1(?=[^~]|$)/,
-  text: /^([`~]+|[^`~])(?:(?= {2,}\n)|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@)|[\s\S]*?(?:(?=[\\<!\[`*~_]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@)))/,
+  text: edit(/^([`~]+|[^`~])(?:(?= {2,}\n)|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@)|[\s\S]*?(?:(?=[\\<!\[`*~_]|\b_|protocol:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@)))/)
+    .replace('protocol', /[hH][tT][tT][pP][sS]?|[fF][tT][pP]/)
+    .getRegex(),
 };
 
 /**
diff --git a/test/specs/new/autolinks.html b/test/specs/new/autolinks.html
index 708f800c5e..bc0fbc0546 100644
--- a/test/specs/new/autolinks.html
+++ b/test/specs/new/autolinks.html
@@ -19,3 +19,5 @@
 <p>Www.example.com</p>
 
 <p>WWW.example.com</p>
+
+<p>(See <a href="hTtPS://example.com/fhqwhgads">hTtPS://example.com/fhqwhgads</a>.)</p>
diff --git a/test/specs/new/autolinks.md b/test/specs/new/autolinks.md
index c77620cbff..e5e41fd761 100644
--- a/test/specs/new/autolinks.md
+++ b/test/specs/new/autolinks.md
@@ -19,3 +19,5 @@ www.example.com
 Www.example.com
 
 WWW.example.com
+
+(See hTtPS://example.com/fhqwhgads.)