RegexPal
A browser-based regular-expression tester for entering patterns and examining matches.
About RegexPal
RegexPal is a free, browser-based tool for testing regular expressions and substitutions. It supports JavaScript, PCRE, and PHP regex syntax, and updates match and substitution results in real time as users input patterns and test strings. The tool includes features for saving and sharing expressions, accessing a library of example and community patterns, undo/redo functionality, and hover details for matches, expressions, and substitutions. It is not optimized for mobile devices and requires a modern browser to operate.
Key features
- Real-time regex match and substitution result updates as you type
- Supports JavaScript, PCRE, and PHP regular expression syntax
- Save and share regular expressions with other users
- Searchable library of community and example regex patterns
- Hover tooltips for match, expression, and substitution details
- Undo/redo functionality for regex pattern and substitution edits
Best for: It is most useful for developers, students, and others building or testing regular expressions for JavaScript, PCRE, or PHP projects.
Good for
- Free to access with no required payment
- Real-time result updates reduce testing friction
- Includes a searchable library of example and community patterns
Watch out for
- Not optimized for mobile devices, may be quirky on small screens
- Requires a modern, up-to-date web browser to function
- Account registration is required for site discussion forums and premium features
RegexPal at a glance
- Website
- regexpal.com
- Category
- Development › Developer Tools
- Type
- Online tool
- Pricing
- Free
- Open source
- Not stated
- Last checked
- Oct 9, 2026 · Online when checked
- Listed
- Oct 9, 2026
Guides for Developer Tools
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RegexPal FAQ
What regular expression syntax flavors does RegexPal support?
It supports JavaScript, PCRE, and PHP regular expression syntax.
Do regex test results update automatically as I type?
Yes, match and substitution results update in real time as you enter patterns and test strings.
Is there a cost to use RegexPal?
No, the tool is free to access with no required payment.
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