Regex Tester (Match/Groups/Replace Vista previa)
A regex tester you can use instantly—paste your pattern and text and confirm the result in one screen. Matches are highlighted, and capture groups plus replacement previews are shown together.
Everything runs locally in your browser. Nothing is sent to a server.
Evaluated with JavaScript (ECMAScript) regex. Behavior may differ from PCRE.
Details
Opciones
How to use
Type your regex and pick the flags you need.
Highlights appear on the right as you type.
Check matches, groups, and replacements in the tabs.
Notas
This tool evaluates JavaScript regex.
- Some PCRE-only features (like atomic groups) are not available.
- Named groups and lookbehind can differ by environment.
- Resultadoados are not guaranteed to match PCRE exactly.
Verify results before production use because PCRE behavior can differ.
FAQ
What are the g/i/m flags?
Toggle them via the checkboxes. (g=global, i=ignore case, m=multiline)
Can I test replacements?
Enter a replacement string to see the Replace tab update. $1-style group references work too.
Is this different from PCRE?
S?. This tool uses JavaScript regex, so some patterns behave differently than PCRE.