Regex Builder

Visual regex builder with preset patterns, test string matching, group extraction, and regex explanation

All processing happens in your browser. No data is uploaded.

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Visual regex builder with preset patterns, test string matching, group extraction, and regex explanation

🔒All processing happens in your browser. No data is uploaded.

Preset Patterns

Regex Pattern

/gm

Flags

g Global

i Case Insensitive

m Multiline

s Dot All

/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/gm

Test String

Match Result

test@example.com
invalid-email
user.name+tag@domain.co.uk
192.168.1.1

2 matches found

Match #1

at index 0

test@example.com

Match #2

at index 31

user.name+tag@domain.co.uk