Projects sharing features with Regexr

highlight.js is a JavaScript syntax highlighter and client-side code formatter that transforms plain text source code into highlighted HTML for web display. It provides syntax highlighting across a wide variety of programming languages. The library includes an automatic language detector that identifies the programming language of a code block to apply the correct highlighting rules without manual tagging. It is designed for web worker compatibility, allowing the highlighting process to run in background threads to prevent the browser interface from freezing during the processing of large vol

CodeMirror 5 is a browser-based code editor and extensible UI component. It functions as a syntax highlighting engine and a programmable text surface, providing a professional coding experience embedded within web pages. The project is distinguished by its ability to act as a collaborative text editor, synchronizing document changes across multiple users in real time. It also includes a dedicated Vim emulation layer that implements modal keyboard interactions, motions, and operators. The system covers broad capability areas including language support for autocompletion and error analysis, co

Prism is a JavaScript syntax highlighter and web-based code formatter. It functions as an extensible syntax engine designed to colorize and format code blocks on web pages, making various programming languages easier to read. The project processes raw code strings into styled HTML elements for use in frontend content rendering, technical documentation, and static site generation. It provides a modular system for adding custom language definitions and highlighting rules to a web-based code viewer.

This project is a regular expression learning resource and tutorial designed to teach the syntax and logic used to find, match, and manipulate text strings. It serves as a comprehensive guide and syntax reference for building complex search queries and data validation logic. The material covers the use of meta-characters, quantifiers, and boundary markers to define precise text match patterns. It includes instructional content on the logic of greedy and lazy matching, as well as the implementation of capture groups. The resource details a wide range of pattern matching capabilities, includin

Highlight.js is a syntax highlighting library that automatically detects and applies color-coded styling to source code blocks within web pages. It functions as a language-agnostic formatting engine, utilizing a modular processor that applies consistent visual themes to diverse programming languages based on their specific grammatical rules. By decoupling the core parsing logic from language-specific definitions, the library provides a unified execution environment that operates without requiring internal knowledge of the target language. The project is distinguished by its modular architectu

Pry is a programmable Ruby shell, REPL console, and runtime developer environment. It serves as a debugging toolkit for inspecting object state, navigating bindings, and evaluating code within a running Ruby program. The project differentiates itself through advanced introspection and live iteration capabilities. It allows users to inject an interactive console into a running program at specific points to inspect local state and navigate different object scopes. It further enables live code iteration by integrating with external system editors to modify and reload method definitions without r

This project is a Python terminal user interface library and toolkit designed for building interactive command-line applications. It provides a terminal input manager and a widget toolkit for rendering dashboards, menus, and editors within a terminal emulator. The library enables the creation of full-screen terminal interfaces and interactive shells. It distinguishes itself with advanced input handling, including lexer-based syntax highlighting for visual feedback on code structure and support for industry-standard keyboard navigation modes such as Emacs and Vi. The capability surface covers

react-syntax-highlighter is a React component that renders source code with language-specific syntax coloring. It wraps the Prism and Highlight.js syntax highlighting libraries, tokenizing source code using their language grammars and mapping each token to a styled React element. The component operates in two styling modes: inline style objects applied directly to each token, or CSS class names that can be themed via external stylesheets. This dual-mode approach makes the highlighter portable across environments where CSS class injection may or may not be available. The component is built aro

PSReadLine is a command line editor, completion engine, history manager, and syntax highlighter for the PowerShell console. It provides a bash-inspired line editing experience that enables advanced cursor movement and text manipulation within the terminal. The project features a customizable input mapper for assigning keyboard shortcuts to specific actions and navigation logic. It includes a completion system that suggests matching commands through selectable menus or prefix-based matching. The tool covers real-time color coding for command text and error notifications to improve readability

react-live is a suite of tools for in-browser React transpilation, live editing, and interactive documentation. It provides a React component for building live playgrounds where source code is transpiled and rendered in real time, accompanied by a live code editor that offers syntax highlighting and immediate visual feedback. The project enables the creation of living documentation by embedding editable React code examples alongside their rendered output. It supports the execution of editable markup or functional components, allowing users to modify code and observe the resulting behavior ins

Code-prettify is a browser-based tool and HTML syntax highlighter that adds visual formatting and line numbers to raw code blocks on web pages. It functions as a client-side code formatter and a customizable lexer library for defining language-specific highlighting rules. The system allows for the creation of custom lexers to provide syntax highlighting for proprietary or uncommon programming languages. Visual presentation is managed through custom code styling and the integration of external CSS stylesheets to define colors and fonts. The project provides automatic syntax highlighting and s

kanagawa.nvim is a Lua-based colorscheme for NeoVim that provides a high-contrast visual theme based on a traditional Japanese art color palette. It functions as a comprehensive styling system for the editor, applying semantic syntax highlighting to code structures and plugins. The project features a system for switching between different lighting variants, such as warm, deep dark, and light modes. It includes utilities for customizing specific palette colors and highlight groups, as well as the ability to export color definitions to external terminal emulators and shells for cross-applicatio

Trust is a game theory educational simulation and interactive learning tool. It functions as a web-based application designed to teach the mechanics of cooperation and social dynamics through guided discovery and behavioral simulations. The project is developed as a multilingual educational application, providing localized content and metadata to make game theory instruction accessible to a global audience in multiple languages. The application utilizes interactive educational content and simulations to explain theoretical concepts, supported by a state-machine driven narrative and client-si

VimTeX is an integrated development environment for authoring and compiling LaTeX documents within Vim and Neovim. It functions as a comprehensive suite for technical document authoring, combining the roles of a syntax highlighter, document navigator, and autocompletion engine. The plugin distinguishes itself through a coordinated workflow that manages asynchronous compilation and bidirectional synchronization with external PDF viewers. This allows users to jump between specific source locations and their rendered pages while maintaining a responsive editor interface during document productio

The Book of Shaders is an interactive educational guide and curriculum for learning GLSL fragment shader programming to create procedural graphics and visual effects. It provides a structured learning path and a categorized reference guide for data types, built-in functions, and mathematical operations used in shader development. The project features a web-based shader sandbox and interactive editor that allows for real-time iteration and visualization of GLSL code. Users can experiment with procedural art and share their results via unique URLs. The curriculum covers a wide range of graphic

PHP-Error is a web development utility and error handler that intercepts application exceptions, syntax errors, and fatal errors to replace default engine output with formatted HTML diagnostic pages during local testing. It activates automatically upon startup without requiring manual initialization calls within project code. The system features interactive diagnostics that include contextual syntax highlighting for code snippets, path-based stack trace filtering to separate external library code from application logic, and inline remote file editing capabilities that persist code modificatio

Laravel Tinker is an interactive shell that boots the full Laravel application context, allowing you to run PHP code, test models, and experiment with the framework in real time from the command line. It integrates PsySH as its underlying REPL engine, providing features like automatic namespace resolution, command history persistence, and on-demand class loading through Composer's autoloader. The tool handles the full lifecycle of a Laravel console command, from defining input signatures and prompting for missing arguments to executing commands programmatically and queuing them for background

LightTable is an extensible source code editor and integrated development environment designed as an interactive programming environment. It enables the evaluation of programming language fragments in real time to provide instant feedback on expressions. The workspace functions as a remote execution environment, connecting to and managing external servers to run code within remote processes. It allows for an interactive workflow where users can execute code fragments and track expression values without restarting the environment. The system provides source code editing capabilities, includin

massCode is a local-first developer workspace application that combines a code snippet manager, a markdown knowledge base, and an HTTP client tool. It serves as a productivity suite for software engineers to consolidate reusable code fragments, technical documentation, and API collections within a single environment. The application distinguishes itself by integrating a developer utility suite for natural language calculations, sample data generation, and JSON visualization. It also includes visual project mapping capabilities, allowing users to create mind maps and sketch diagrams alongside

CodeMirror is a browser-based code editor framework and modular extension system used to embed full-featured text editors into web pages. It functions as a syntax tree parsing engine and a language server protocol client, enabling structural language analysis and deep integration with external programming language services. The project is distinguished by its modular architecture, which uses a system of extensions and compartments for dynamic reconfiguration at runtime. It supports real-time collaborative editing and state synchronization through an operational transformation framework, allow

react-syntax-highlighter is a component for rendering source code with syntax highlighting in React applications. It acts as a wrapper for the PrismJS and Highlight.js engines to provide formatted code display and language-specific colors. The project provides a customizable code block renderer that supports custom DOM injection, line numbering, and inline styling. It allows users to replace default HTML tags with custom React components to control how code is injected into the document object model. The library covers code presentation management through visual themes and line numbering. It

This project is a responsive Jekyll static site theme designed for technical blogs, documentation, and multilingual websites. It focuses on text readability and the presentation of technical content, providing a customizable CSS theme with multiple color palettes and dark mode toggling. The theme distinguishes itself through specialized rendering for technical assets, including mathematical formulas, diagrams, and syntax-highlighted code. It includes built-in internationalization support via translation keys to facilitate the creation of sites in multiple languages. The capability surface co

This project provides an interactive notebook environment designed for executing C# code alongside instructional text. It functions as a platform for data science and programming education, allowing users to manipulate tabular data, visualize statistical results, and prototype machine learning workflows within a unified document format. The environment utilizes a kernel-based execution model that maintains persistent state and variable scope across notebook cells. By leveraging a language-agnostic protocol and standardized messaging, it synchronizes code execution between the editor and the b

Chroma is a syntax highlighter written in Go that converts raw source code into colorized text or HTML. It identifies programming languages and tokens using language-specific lexers to produce highlighted output for various environments. The project utilizes a theme-driven colorization system that decouples token types from final colors through an intermediate style mapping layer. This allows for custom code theming by mapping specific token categories to foreground and background colors. The system covers language identification, terminal text formatting for ANSI-compatible viewers, and web

Acode is a code editor designed for mobile devices. It provides syntax-highlighted editing for multiple programming languages, an integrated JavaScript console for running and debugging scripts, and a built-in web preview that renders local HTML, CSS, and JavaScript projects in an embedded browser. The editor is extensible through a plugin system, which includes a dedicated JavaScript API for building custom plugins and a curated repository for community plugin installation. Plugins are auto-installed and can hook into the editor's lifecycle, UI, and file operations. Language support is confi

You-need-to-know-css is a curated library of pre-written CSS code snippets for common frontend styling tasks including layout patterns, visual effects, animations, and component styling. It serves as a quick reference for developers looking to implement ready-to-use styling solutions without writing CSS from scratch. The collection is organized by visual effect or layout category, with each snippet presented on a standalone page that includes syntax-highlighted code, property documentation explaining the CSS rules and their values, and a live inline demo rendered inside an isolated iframe to

jless is an interactive JSON explorer and command-line viewer designed for reading and navigating hierarchical data structures within a terminal. It functions as a terminal JSON formatter that pretty-prints data from files or standard input, including support for newline-delimited formats. The tool serves as a JSON path extractor, allowing users to identify and copy the dot or bracket notation paths from the root to specific nodes. It also includes a regex search utility for locating specific keys and values within JSON datasets using full-text regular expressions. The application provides c