Regex Tester
Test your Regular Expressions against strings with real-time highlighting and breakdown.
//
Contact us at support@example.com or sales@company.co for more info.
| # | Match | Index |
|---|---|---|
| 1 | support@example.com | 14 - 33 |
| 2 | sales@company.co | 37 - 53 |
Runs locally in your browser. 100% private & secure.
About Regex Tester
What is a Regular Expression?
A Regular Expression (Regex or RegExp) is a sequence of characters that specifies a search pattern in text. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation.
Common Flags
- g (Global): Don't return after the first match, restart the subsequent searches from the end of the previous match.
- i (Insensitive): Case-insensitive search.
- m (Multiline): Anchors (
^and$) match the start and end of every line, instead of just the whole string. - s (DotAll): Allows the dot (
.) to match newline characters.
Frequently Asked Questions
Which flavor of Regex does this support?
Since this tool runs in your browser, it uses the native JavaScript (ECMAScript) Regular Expression engine.