Regex Tester
Run regex patterns against sample text and inspect matches quickly.
Input
Paste dataOutput
ResultExample
This example shows a typical input and the kind of result you can expect from Regex Tester.
Example Input
Pattern: dev\w+ Flags: gi Text: DevTools Developer Design
Example Output
Matches "DevTools" and "Developer"
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About Regex Tester
Regex Tester gives you a fast place to try a regular expression against sample text before moving it into production code, validation logic, or search workflows.
It is helpful when you need to confirm whether a pattern, set of flags, or capture group behaves the way you expect.
Instead of guessing how a pattern will match, you can test it directly with real text and inspect the result immediately.
How To Use Regex Tester
- 1Enter the regex pattern, optional flags, and sample text you want to test.
- 2Run Regex Tester to execute the pattern against the provided input.
- 3Review the match output and refine the pattern until it behaves the way you need.
Common Use Cases
- Validate a regex before adding it to form validation or parsing logic.
- Debug patterns used for search, extraction, sanitization, or text cleanup.
- Share working regex examples with teammates during implementation or review.
FAQ
What does Regex Tester do?
Regex Tester runs a regular expression against sample text so you can inspect matches, flags, and output behavior quickly.
When should I use Regex Tester?
Use it before shipping a regex into application code, validation rules, text extraction logic, or transformation scripts.
Can Regex Tester help with debugging patterns?
Yes. It is useful for checking whether a pattern overmatches, undermatches, or fails entirely on real input.
Who is Regex Tester best for?
Regex Tester is best for frontend engineers, backend engineers, QA teams, and anyone writing pattern-based text logic.