Test regular expressions online, highlight matching text, view match count, check capture groups, use flags, and copy or download your regex results.
Useful for developers, SEO teams, data cleanup, log checks, form validation, and text extraction.
Enter your regex pattern and sample text to instantly test matches, flags, and groups.
| # | Match | Index | Length | Groups |
|---|---|---|---|---|
| Run the tester to see match details. | ||||
A regex tester helps you build, test, and debug regular expressions before using them in real projects.
See exactly which parts of your text match your regex pattern with clear highlighted output.
Check capture groups, match index, match length, and extracted values in a clean results table.
Test flags, improve validation patterns, find mistakes, and copy the final regex quickly.
Regex, also called regular expression, is a pattern used to search, match, validate, or extract text. Developers use regex for emails, URLs, phone numbers, IDs, dates, logs, forms, and large text cleanup tasks.
A regex tester makes pattern building easier because you can see matches instantly instead of guessing why a pattern works or fails.
| Regex Symbol | Meaning | Example |
|---|---|---|
| . | Matches any character except newline | a.c matches abc |
| \d | Matches a digit | \d+ matches 123 |
| \w | Matches word characters | \w+ matches hello |
| * | Zero or more times | a* matches empty or aaa |
| + | One or more times | a+ matches a or aaa |
| () | Capture group | (abc) captures abc |
Test a regex pattern in three simple steps.
Type your regex pattern and select flags such as global, ignore case, multiline, or unicode.
Paste the content where you want to find matches, validate values, or extract data.
See highlighted matches, match count, capture groups, index positions, and copy the report.
Common questions about regex patterns, flags, matches, groups, and testing.