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Regex Tester

Validate your regular expressions with dynamic highlights.

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Matches

Flags

gmu

Reading

Direct

Batch

2 docs

Pattern and presets

Expression and presets

Regular expression

Presets

Flags

Text and reading

Input text

37 / 200,000

Preview with highlights

contato@exemplo.com.br admin@teste.io

Result

Found

Match 1

contato@exemplo.com.br

0 → 22

Match 2

admin@teste.io

23 → 37

Advanced analysis

Replace and split

Replace template

Replace preview

contato@exemplo.com.br admin@teste.io

Split preview

Document batch

Batch

Documento 1

0 matches

No match

Documento 2

0 matches

No match

About ReDoS: This tool detects patterns with nested quantifiers, ambiguous alternation and consecutive .* — classic Regex Denial of Service vectors. In production, NEVER use user-provided regex in server-side code without a timeout. Everything is processed locally in your browser. Limits: pattern ≤ 5k chars; input ≤ 200 KB.

§ How to use

How to test a regular expression

Test and debug regex against your text with live match highlighting — fully in-browser.

Enter your regex
Type the pattern and toggle flags (global, ignore-case, multiline).
Add test text
Paste the sample text. Matches are highlighted live as you edit the pattern.
Inspect matches
See each match and its capture groups, plus the count — to refine the pattern safely.