Our Regex Tester was built to help you write and verify regular expressions quickly without opening the browser console or a heavy IDE.
Why use Regex Tester
- it highlights matches in real time with different colours;
- it supports common flags such as global, multiline, and case insensitive;
- it makes it easy to save and share examples.
Practical tips
- Start simple: write a minimal pattern and check that it works before increasing the complexity.
- Test edge cases: paste into the text field the samples you know will be tricky.
- Compare versions: rely on Diff Checker to quickly see what changes between two regexes.
If you work mostly on the back end you can also use the tester as the base for automated tests: once the regex is ready, move it into your code and add the same examples to avoid regressions.