Regex Tester
Test regular expressions against sample text with live matches.
Iterate on regular expressions quickly by inspecting matches, flags, and optional highlighted output in one place.
Input
Matches
Matched 1
1234
Matched 2
2026
Matched 3
03
Matched 4
24
Highlighted Preview
Order #1234 shipped on 2026-03-24.
How to use Regex Tester
- 1Enter a regular expression pattern and choose flags.
- 2Paste sample text to test against.
- 3Review match groups and the highlighted preview as you refine the pattern.
Use Cases
Iterate on input validation patterns without switching to a terminal or IDE plugin.
Test parsing patterns against sample logs, URLs, or data extracts.
FAQ
Which flags are supported?
This tester supports the common g, i, and m flags.
What if the regex is invalid?
The tool reports the regex syntax error instead of failing silently.
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