gskinner/regexr

Health v2 · maintenance only

Adoption not part of the score

10353 stars · 1003 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

RegExr is an HTML/JS web application for creating, testing, and learning about Regular Expressions, with real-time match highlighting, expression explanations, a full reference, and community pattern sharing. It supports JavaScript and PHP/PCRE regex flavors and is the codebase behind regexr.com.

Use cases

• test regular expressions online
• learn regex syntax with examples
• debug a regex pattern and see matches in real time
• explain what a regular expression means in plain English
• validate regex patterns with test suites
• find and share community regex patterns

When to choose

• you want an interactive, browser-based regex editor with live match feedback
• you need to learn or teach regular expressions with a built-in reference and cheatsheet
• you work with both JavaScript and PCRE regex flavors
• you want to save and share regex patterns with others

When to avoid

• you need a command-line or offline-only regex tool
• you need regex flavors beyond JavaScript and PCRE (e.g., .NET, Java, Rust)
• you want programmatic regex testing integrated into a CI pipeline

Facets

application · maturity active

developer-tools parser testing documentation developer-tools web-development education tutorials browser cross-platform regex regular-expressions online-tool pattern-testing learning-tool pcre javascript web-server nodejs

Member repositories

For agents

markdown · JSON · MCP: product_card(name="gskinner/regexr")