Regex Tester
Test regular expressions against text. See matches, capture groups, and flags (g, i, m, s).
About this tool
Enter a regex pattern and test string. Use g for all matches, i for case-insensitive, m for multiline, s for dotall. Invalid patterns show an error; valid ones list match index, full match, and capture groups.
For flavor comparison and step-by-step debug: regex101.com.
Flags:
Click "Test" to run the regex against the test string.
Search intent cluster
- Regex Validator
- Regex Debugger
- Pattern Tester
- Expression Tester
- Regex Analyzer
Entity keywords
regular expressionsregex testingpattern matchingtext validationcapture groupsflagsstring matchingsyntax checking
How to use this tool
- Enter your regular expression in the input field.
- Paste the text you want to test against in the corresponding area.
- Click 'Test' to view matches, capture groups, and any syntax errors.
What this check helps you catch
- Test regex patterns
- View matches
- Inspect capture groups
- Apply flags
- Validate syntax
FAQ
- What does Regex Tester check?
- Regex Tester checks input validity, structure, and common implementation issues so you can catch errors before deployment.
- Can I use Regex Tester in CI or QA workflows?
- Yes. Use it during QA or pre-release checks to reduce runtime failures caused by invalid data.
- Does this tool store my data?
- No persistent storage is required for normal validation flow unless you explicitly save reports.