Regex Tester
Quickly test a regular expression against sample text and see matched results directly in your browser.
Enter the regex pattern without the surrounding slash characters. Use the flag cards below to change matching behavior.
Match Options
Paste the text you want to check. The tool highlights matches and shows match positions below.
Match Preview
Matching text is highlighted below. Use the advanced regex tool when you need named groups, replacement preview, or JSON output.
Result Output
Regex test results will appear here.
Testing Regex Patterns Quickly
Regular expressions are useful for matching emails, IDs, URLs, logs, codes, and text patterns. But a small change in a pattern can change what gets matched, so it helps to test against real sample text.
This Regex Tester is a quick browser-first way to check a pattern, toggle common flags, highlight matches, and inspect basic capture groups without sending your text anywhere.
Checking a Regular Expression
- Enter a regex pattern without the outer slash characters.
- Choose flags such as global, ignore case, or multiline.
- Paste text into the test box.
- Review highlighted matches and match positions.
- Copy the match results when needed.
Common Regex Tester Use Cases
- Checking email, URL, ID, slug, or code patterns.
- Testing a validation regex before using it in code.
- Extracting simple values from logs or pasted text.
- Checking whether global and ignore-case flags are needed.
- Reviewing basic capture groups before writing code.
Quick Regex Tester vs Advanced Match Tester
This page is for fast pattern checks. For named groups, replacement preview, structured JSON output, and deeper match details, use the Regex Match Tester.
Example Regex Test
Pattern:
\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}\b
Flags:
gi
Text:
Contact support@example.com or billing@example.org.
Matches:
support@example.com
billing@example.orgFrequently Asked Questions
What is a regex tester?
A regex tester checks a regular expression against sample text and shows which parts of the text match.
Should I include slashes around the regex?
No. Enter only the pattern body, then select flags separately.
Why do I only see one match?
Enable the global flag to find every match instead of stopping after the first one.
Is my text uploaded anywhere?
No. Regex testing happens directly in your browser, and your text is not uploaded to a server.