From 0155fa8efc379db2ab35f00a01a6b3e7d3d3da0b Mon Sep 17 00:00:00 2001
From: Jonas <jonas@freesources.org>
Date: Fri, 8 May 2026 21:19:12 +0200
Subject: [PATCH] fix(code): fix regex to not eat preceding character

Fixes: #5483

This bug got introduced in upstream Tiptap with
https://github.com/ueberdosis/tiptap/pull/5916, which removes named
capturing groups and lookbehind assertions from the regex in order to
fix support for Safari < 16.4.

Upstream issue https://github.com/ueberdosis/tiptap/issues/6358 tracks
this bug a ping some months back whether it would be an option to revert
this change nowadays didn't get any reply.

So let's overwrite the regexes on our side.

Signed-off-by: Jonas <jonas@freesources.org>
---
 playwright/e2e/input-rules.spec.ts | 20 +++++++++++++++++++
 src/marks/Code.ts                  | 31 ++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 playwright/e2e/input-rules.spec.ts

diff --git a/playwright/e2e/input-rules.spec.ts b/playwright/e2e/input-rules.spec.ts
new file mode 100644
index 00000000000..3cebc251bbc
--- /dev/null
+++ b/playwright/e2e/input-rules.spec.ts
@@ -0,0 +1,20 @@
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+import { expect, mergeTests } from '@playwright/test'
+import { test as editorTest } from '../support/fixtures/editor'
+import { test as uploadFileTest } from '../support/fixtures/upload-file'
+
+const test = mergeTests(editorTest, uploadFileTest)
+
+test('applies code mark input rule with preceding character (#5483)', async ({
+	editor,
+	open,
+}) => {
+	await open()
+	await editor.type('hello inline (`code`)')
+	await expect(editor.el.locator('code')).toHaveText('code')
+	await expect(editor.el.locator('p').first()).toHaveText('hello inline (code)')
+})
diff --git a/src/marks/Code.ts b/src/marks/Code.ts
index 58c85b33651..d54e4bf5cb6 100644
--- a/src/marks/Code.ts
+++ b/src/marks/Code.ts
@@ -3,11 +3,42 @@
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
 
+import { markInputRule, markPasteRule } from '@tiptap/core'
 import TipTapCode from '@tiptap/extension-code'
 
+/**
+ * Regular expressions to match inline code blocks enclosed in backticks.
+ * Reverts upstream PR https://github.com/ueberdosis/tiptap/pull/5916 which
+ * introduced isuee https://github.com/nextcloud/text/issues/5483.
+ */
+export const inputRegex = /(?<!`)`([^`]+)`(?!`)/
+
+/**
+ * Matches inline code while pasting.
+ */
+export const pasteRegex = /(?<!`)`([^`]+)`(?!`)/g
+
 const Code = TipTapCode.extend({
 	// List all enabled marks except 'code' and 'link' (issue #4900)
 	excludes: 'em strike strong underline',
+
+	addInputRules() {
+		return [
+			markInputRule({
+				find: inputRegex,
+				type: this.type,
+			}),
+		]
+	},
+
+	addPasteRules() {
+		return [
+			markPasteRule({
+				find: pasteRegex,
+				type: this.type,
+			}),
+		]
+	},
 })
 
 export default Code