Developer utility
Regex Playground
Regex tester for pattern debugging, validation, and the traditional five stages of escaping characters.
Privacy by default: your input stays in the browser. No account ceremony, no server confessional.
Best for
- Developers building and debugging regex patterns.
- Content teams validating structured text rules.
- Anyone learning regular expressions by testing live.
When to use
- You need instant feedback while refining a pattern.
- You want to verify capture groups and match behavior.
- You are testing examples before using regex in code.
Pattern
Write your regex
Type a pattern, toggle flags, then paste text to match against.
//g
Test input
Paste your text
Every match is highlighted in the output panel.
Matches
Highlighted output
Matches will be highlighted here.
FAQ
What regex flags should I start with?
Start with global (g) for multiple matches, then add case-insensitive (i) or multiline (m) only when needed.
Why does a pattern match in one tool but not in another?
Different engines can vary. This playground is useful for fast iteration before moving patterns into your runtime environment.
Can I inspect match positions?
Yes. The matches list shows each matched value with its index so you can verify pattern behavior precisely.