Text & String
Regex Tester
Test and debug regular expressions
Regular Expression
//g
Presets:
Test String
Replace
Quick Reference
Character Classes
. - any character\d - digit\w - word char\s - whitespace[abc] - a, b, or cQuantifiers
* - 0 or more+ - 1 or more? - 0 or 1{n} - exactly n{n,m} - n to mAnchors
^ - start$ - end\b - word boundaryGroups
(abc) - capture(?:abc) - non-capturea|b - orWhy Use Regex Tester?
- ✓100% Free - No hidden costs or premium features
- ✓No Signup Required - Start using instantly without creating an account
- ✓Privacy First - All processing happens in your browser. Your data never leaves your device
- ✓Lightning Fast - Instant results with no server delays
How to Use
- Enter or paste your text in the input area above
- The tool will automatically process your input
- Copy the result or download it as a file
Features
- ✓Real-time pattern matching
- ✓Flag toggles (g, i, m, s, u)
- ✓Capture group display
- ✓Common regex presets
- ✓Pattern explanation
Frequently Asked Questions
What is a regular expression?
A regular expression (regex) is a sequence of characters that defines a search pattern. It is used for pattern matching, text validation, and string manipulation.
What regex flags are supported?
We support all JavaScript regex flags: g (global), i (case-insensitive), m (multiline), s (dotAll), and u (unicode).