What is a Regex Tester?
A regex tester lets you try regular expressions against sample text, view matches and capture groups, and tweak flags without writing code. It is ideal for crafting validation rules, search patterns, and quick text checks.
Why use it?
- Validate patterns faster: See matches instantly as you edit.
- Debug with flags: Toggle global, case-insensitive, multiline, dotAll, Unicode, or sticky modes.
- Check groups: Inspect captured groups to confirm your pattern extracts the right pieces.
How to use
- Enter a regex pattern and paste or type test text.
- Toggle flags in Settings or choose a preset pattern to start.
- Review highlights in the text and the match list with indexes and groups.
Tips
- Add anchors (
^,$) when matching whole lines. - Use non-greedy quantifiers (
*?,+?) to avoid over-capturing. - Prefer explicit character classes over
.*for predictable matches.