DeveloperFree · 3 uses/dayProcessed in your browser
Regex Tester
Test your regular expressions with live match highlighting.
Matches
2
Flags
gmu
Reading
Direct
Batch
2 docs
01
Pattern and presets
Expression and presets
Regular expression
Presets
Flags
02
Text and reading
Input text
37 / 200,000
Preview with highlights
contato@exemplo.com.br
admin@teste.io
03
Result
Found
Match 1
contato@exemplo.com.br
0 → 22
Match 2
admin@teste.io
23 → 37
04
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.
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