Regex Tester

Test JS Regex

Regex Tester

Test JS Regex

Pattern

Flags

Test String

Match Information

No matches found

0 matches

JavaScript Regex Tester & Debugger

Test and debug your JavaScript regular expressions in real-time. Supports global searches, case-insensitive matching, and multi-line modes. See matches, indices, and capturing groups instantly.

How to Use

1. Enter your regex pattern in the top field. 2. Add flags (e.g., g, i, m). 3. Type your test string in the main area. 4. View matches on the right.

Regex examples

Validate patterns with a few focused samples.

-Match emails with anchors.
-Extract IDs with capture groups.
-Test case-insensitive matches.

Regex pitfalls

Small mistakes can cause overmatching.

-Missing anchors leads to false positives.
-Greedy quantifiers consume too much.
-Unescaped characters break patterns.

Frequently Asked Questions

What flavor of regex is this?

This tool uses the standard JavaScript (ECMAScript) RegExp engine.

Which regex flavor is supported?

JavaScript RegExp with standard flags.

Why no matches?

Check flags, escaping, and input lines.

Can regex be slow?

Yes, avoid catastrophic backtracking.

Acerca de Tester Regex

Usa Tester Regex para Probar regex JS. La herramienta funciona en tu navegador, ofrece resultados rápidos y mantiene tus datos locales.

Como usar

1. Agrega tu entrada o datos.\n2. Ajusta opciones si es necesario.\n3. Revisa el resultado y copia.

Preguntas frecuentes

¿Tester Regex es gratis?

Sí. Tester Regex es gratuito y funciona directamente en tu navegador.

¿Tester Regex sube mis datos?

No. La mayoría del procesamiento es local. Cualquier solicitud de red se indica claramente.

?Qu? formatos admite Tester Regex?

Tester Regex admite los formatos comunes descritos en la p?gina. Convierte los formatos poco comunes antes de pegar.

?C?mo debo compartir los resultados de Tester Regex?

Copia la salida y revisa datos sensibles antes de compartir o publicar.