R
Resizzer
Ferramentas de Desenvolvedor 100% de privacidade no navegador

Testador de Expressões Regulares Online

Valide padrões regex com feedback imediato em um ambiente seguro e isolado no navegador.

Presets:
/ / g
Flags:
Matches Found: 0 matches
Como usar esta ferramenta

Three simple steps to process your files

01

Enter Regular Expression

Type or paste your pattern in the regex field, selecting any desired matching flags.

02

Input Test Text

Paste the string or log excerpt you want to validate against your pattern.

03

Inspect Matches & Groups

View highlighted matching substrings, total match counts, and capture group breakdowns in real time.

Principais recursos

Engineered for speed, fidelity & security

Full Flag Configuration

Toggle global (g), case-insensitive (i), multiline (m), dotAll (s), unicode (u), and sticky (y) flags.

Real-Time Match Highlighting

Visual color-coded highlight overlay on your test string updating as you type.

Capture Group Explorer

Detailed breakdown of full matches and numbered or named capture groups with character positions.

Instant Syntax Error Diagnostics

Immediate feedback on unescaped parentheses, invalid range quantifiers, and syntax mistakes.

One-Click Pattern Presets

Built-in regex templates for emails, URLs, dates, phone numbers, and IPv4 addresses.

Safe Sandbox Execution

Pure native RegExp engine parsing without unsafe eval() or server transmission.

FAQ

Perguntas frequentes

Which JavaScript regex flags are supported?
The tester supports g (global), i (ignore case), m (multiline), s (dotAll), u (unicode), and y (sticky).
How are capture groups displayed?
Matches are numbered sequentially, with each group (Group 1, Group 2, etc.) listed alongside its character indices and matched value.
Is it safe to test proprietary data or secrets?
Yes. The regular expression engine runs 100% locally within your browser. Nothing is sent over the network.
Can catastrophic backtracking freeze my browser?
We wrap pattern execution in safe try-catch blocks and safeguard iteration to prevent UI freezes on problematic expressions.
Ferramentas relacionadas

Explore complementary utilities

Formatador e Validador JSON

Formate, embeleze, minifique e valide dados JSON com detecção detalhada de erros de sintaxe.

Open Tool

Formatador e Validador JSON

Formate, embeleze, minifique e valide dados JSON com detecção detalhada de erros de sintaxe.

Open Tool

Redimensionar Imagem

Altere o tamanho de imagens JPG, PNG e WebP por pixels, escala ou modelos para redes sociais.

Open Tool