[PR #22184] Feat: katex render more equations correctly by splitting delimiters into strict and loose types #26537

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2026-04-20T06:33:35-05:00

GiteaMirror commented

2026-04-20 06:33:35 -05:00

📋 Pull Request Information

Original PR: https://github.com/open-webui/open-webui/pull/22184
Author: @yangqian
Created: 3/3/2026
Status: 🔄 Open

Base: dev ← Head: feat/katex-strict-loose-delimiters

📝 Commits (1)

55e51c7 feat: split KaTeX delimiters into strict and loose groups

📊 Changes

1 file changed (+53 additions, -23 deletions)

View changed files

📝 src/lib/utils/marked/katex-extension.ts (+53 -23)

📄 Description

Pull Request Checklist

Note to first-time contributors: Please open a discussion post in Discussions to discuss your idea/fix with the community before creating a pull request, and describe your changes before submitting a pull request.

This is to ensure large feature PRs are discussed with the community first, before starting work on it. If the community does not want this feature or it is not relevant for Open WebUI as a project, it can be identified in the discussion before working on the feature and submitting the PR.

Before submitting, make sure you've checked the following:

Target branch: Verify that the pull request targets the dev branch. PRs targeting main will be immediately closed.
Description: Provide a concise description of the changes made in this pull request down below.
Changelog: Ensure a changelog entry following the format of Keep a Changelog is added at the bottom of the PR description.
Testing: Perform manual tests to verify the implemented fix/feature works as intended AND does not break any other functionality. Include reproducible steps to demonstrate the issue before the fix. Test edge cases (URL encoding, HTML entities, types). Take this as an opportunity to make screenshots of the feature/fix and include them in the PR description.
Agentic AI Code: Confirm this Pull Request is not written by any AI Agent or has at least gone through additional human review AND manual testing. If any AI Agent is the co-author of this PR, it may lead to immediate closure of the PR.
Code review: Have you performed a self-review of your code, addressing any coding standard issues and ensuring adherence to the project's coding standards?
Design & Architecture: Prefer smart defaults over adding new settings; use local state for ephemeral UI logic. Open a Discussion for major architectural or UX changes.
Git Hygiene: Keep PRs atomic (one logical change). Clean up commits and rebase on dev to ensure no unrelated commits (e.g. from main) are included. Push updates to the existing PR branch instead of closing and reopening.
Title Prefix: To clearly categorize this pull request, prefix the pull request title using one of the following:
- BREAKING CHANGE: Significant changes that may affect compatibility
- build: Changes that affect the build system or external dependencies
- ci: Changes to our continuous integration processes or workflows
- chore: Refactor, cleanup, or other non-functional code changes
- docs: Documentation update or addition
- feat: Introduces a new feature or enhancement to the codebase
- fix: Bug fix or error correction
- i18n: Internationalization or localization changes
- perf: Performance improvement
- refactor: Code restructuring for better maintainability, readability, or scalability
- style: Changes that do not affect the meaning of the code (white space, formatting, missing semi-colons, etc.)
- test: Adding missing tests or correcting existing tests
- WIP: Work in progress, a temporary label for incomplete or ongoing work

Changelog Entry

Description

seprate the latex delimiters into two groups such that many latex equations could be rendered while still being conservative with the commonly used dollar signs.

Added

Split KaTeX delimiters into "strict" ((, ), [, ], \ce{}, \pu{}, \begin{equation}) and "loose" (, $) groups. Strict delimiters are unambiguous LaTeX syntax and now match without requiring surrounding-character checks.

Fixed

Prevented inline KaTeX regex from matching across newlines by changing content patterns from [^] to [^\n], fixing cross-line backtracking that could cause intermediate (...) expressions to be consumed by a single greedy ... match.

Additional Information

Fix issue #12036 and many other latex/katex equation related discussions.

Screenshots or Videos

Render

and \(10^3\)-\(10^4\) and
 \(10^3\) ——
$10^3$——
 \(\gamma\)and
x——\(10^4\)
 \(x\)—— and \(y\) 
 \(\gamma\)and\(\gamma_c\) 
 \(\gamma\) and\(\gamma_c\) 
d $\cdotp$ b
d $\cdot$ b

The Handshaking Lemma states that $\sum_{v \in V} \deg(v) = 2|E|$.
If all 5 vertices have degree 3, then:

$$\sum_{v \in V} \deg(v) = 15$$

which is odd — contradicting the lemma. QED.

Before:

After:

Note that the second dollar sign break is intentional.

render:

\(\xi = (\xi_1, \dots, \xi_N)\)xx
\(a^2 + b^2 = c^2\)\(e^{i\pi} + 1 = 0\)

Before:

After:

Contributor License Agreement

By submitting this pull request, I confirm that I have read and fully agree to the Contributor License Agreement (CLA), and I am providing my contributions under its terms.

Note

Deleting the CLA section will lead to immediate closure of your PR and it will not be merged in.

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/open-webui/open-webui/pull/22184 **Author:** [@yangqian](https://github.com/yangqian) **Created:** 3/3/2026 **Status:** 🔄 Open **Base:** `dev` ← **Head:** `feat/katex-strict-loose-delimiters` --- ### 📝 Commits (1) - [`55e51c7`](https://github.com/open-webui/open-webui/commit/55e51c704c605867c3280741b7ea84745e37564d) feat: split KaTeX delimiters into strict and loose groups ### 📊 Changes **1 file changed** (+53 additions, -23 deletions) <details> <summary>View changed files</summary> 📝 `src/lib/utils/marked/katex-extension.ts` (+53 -23) </details> ### 📄 Description  # Pull Request Checklist ### Note to first-time contributors: Please open a discussion post in [Discussions](https://github.com/open-webui/open-webui/discussions) to discuss your idea/fix with the community before creating a pull request, and describe your changes before submitting a pull request. This is to ensure large feature PRs are discussed with the community first, before starting work on it. If the community does not want this feature or it is not relevant for Open WebUI as a project, it can be identified in the discussion before working on the feature and submitting the PR. **Before submitting, make sure you've checked the following:** - [X] **Target branch:** Verify that the pull request targets the `dev` branch. **PRs targeting `main` will be immediately closed.** - [X] **Description:** Provide a concise description of the changes made in this pull request down below. - [X] **Changelog:** Ensure a changelog entry following the format of [Keep a Changelog](https://keepachangelog.com/) is added at the bottom of the PR description. - [X] **Testing:** Perform manual tests to **verify the implemented fix/feature works as intended AND does not break any other functionality**. Include reproducible steps to demonstrate the issue before the fix. Test edge cases (URL encoding, HTML entities, types). Take this as an opportunity to **make screenshots of the feature/fix and include them in the PR description**. - [X] **Agentic AI Code:** Confirm this Pull Request is **not written by any AI Agent** or has at least **gone through additional human review AND manual testing**. If any AI Agent is the co-author of this PR, it may lead to immediate closure of the PR. - [X] **Code review:** Have you performed a self-review of your code, addressing any coding standard issues and ensuring adherence to the project's coding standards? - [X] **Design & Architecture:** Prefer smart defaults over adding new settings; use local state for ephemeral UI logic. Open a Discussion for major architectural or UX changes. - [X] **Git Hygiene:** Keep PRs atomic (one logical change). Clean up commits and rebase on `dev` to ensure no unrelated commits (e.g. from `main`) are included. Push updates to the existing PR branch instead of closing and reopening. - [X] **Title Prefix:** To clearly categorize this pull request, prefix the pull request title using one of the following: - **BREAKING CHANGE**: Significant changes that may affect compatibility - **build**: Changes that affect the build system or external dependencies - **ci**: Changes to our continuous integration processes or workflows - **chore**: Refactor, cleanup, or other non-functional code changes - **docs**: Documentation update or addition - **feat**: Introduces a new feature or enhancement to the codebase - **fix**: Bug fix or error correction - **i18n**: Internationalization or localization changes - **perf**: Performance improvement - **refactor**: Code restructuring for better maintainability, readability, or scalability - **style**: Changes that do not affect the meaning of the code (white space, formatting, missing semi-colons, etc.) - **test**: Adding missing tests or correcting existing tests - **WIP**: Work in progress, a temporary label for incomplete or ongoing work # Changelog Entry ### Description seprate the latex delimiters into two groups such that many latex equations could be rendered while still being conservative with the commonly used dollar signs. ### Added - Split KaTeX delimiters into "strict" ($, $, \[, \], \ce{}, \pu{}, \begin{equation}) and "loose" ($, $$) groups. Strict delimiters are unambiguous LaTeX syntax and now match without requiring surrounding-character checks. ### Fixed - Prevented inline KaTeX regex from matching across newlines by changing content patterns from [^] to [^\n], fixing cross-line backtracking that could cause intermediate $...$ expressions to be consumed by a single greedy $...$ match. --- ### Additional Information Fix issue #12036 and many other latex/katex equation related discussions. ### Screenshots or Videos Render ``` and $10^3$-$10^4$ and $10^3$ —— $10^3$—— $\gamma$and x——$10^4$ $x$—— and $y$ $\gamma$and$\gamma_c$ $\gamma$ and$\gamma_c$ d $\cdotp$ b d $\cdot$ b The Handshaking Lemma states that $\sum_{v \in V} \deg(v) = 2|E|$. If all 5 vertices have degree 3, then: $$\sum_{v \in V} \deg(v) = 15$$ which is odd — contradicting the lemma. QED. ``` Before: <img width="465" height="415" alt="image" src="https://github.com/user-attachments/assets/8434ae37-c08a-42df-b322-01e988b4f986" /> After: <img width="457" height="412" alt="image" src="https://github.com/user-attachments/assets/5b916027-bb29-49c3-bd45-cf193264b227" /> Note that the second dollar sign break is intentional. render: ``` $\xi = (\xi_1, \dots, \xi_N)$xx $a^2 + b^2 = c^2$$e^{i\pi} + 1 = 0$ ``` Before: <img width="260" height="73" alt="image" src="https://github.com/user-attachments/assets/ca119a3f-35b7-4ec7-ae21-ae74abc61359" /> After: <img width="221" height="54" alt="image" src="https://github.com/user-attachments/assets/a7537458-1369-4160-bab0-49622b132610" /> ### Contributor License Agreement  By submitting this pull request, I confirm that I have read and fully agree to the [Contributor License Agreement (CLA)](https://github.com/open-webui/open-webui/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT), and I am providing my contributions under its terms. > [!NOTE] > Deleting the CLA section will lead to immediate closure of your PR and it will not be merged in. --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

GiteaMirror added the pull-request label 2026-04-20 06:33:35 -05:00

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Reference: github-starred/open-webui#26537