iHateRegex
Regular expressions can be tested and shared in iHateRegex, a playground with diagrams and notes.
About iHateRegex
iHateRegex is a web-based regular expression playground designed to help users test, understand, and share regex patterns. It offers live matching to test patterns against input text, visual railroad diagrams that display a pattern's structure, and space to add explanatory notes for complex regex logic. The platform also includes a built-in library of 29 common practical regex patterns for use cases like email validation, phone number matching, and IP address detection, with search functionality to find relevant patterns quickly.
Key features
- Live regex testing with real-time match highlighting
- Browser-rendered railroad diagrams for pattern structure
- Add explanatory notes alongside regex patterns
- Share full workspaces via a single link
- Built-in library of 29 common regex patterns
- Search functionality for the pattern library
Best for: It is most useful for developers, QA professionals, and technical team members who regularly write, test, or collaborate on regular expression patterns.
Good for
- Visual railroad diagrams simplify understanding complex regex structure
- Pre-built pattern library reduces need to write regex from scratch
- One-link workspace sharing streamlines team collaboration on regex
iHateRegex at a glance
- Website
- ihateregex.io
- Category
- Development › Developer Tools
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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iHateRegex FAQ
What visual tool does iHateRegex use to show regex structure?
It uses browser-rendered railroad diagrams to display pattern structure.
Can regex workspaces be shared with other users?
Yes, workspaces can be shared via a single link accessible to team members.
Does iHateRegex provide pre-made regex patterns?
Yes, it includes a searchable library of 29 practical common regex patterns.
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