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Regex Tester

Test regular expressions in real time with highlighted matches, capture groups, replacement preview, and a library of common patterns.
About: Type a pattern and test text to see matches live; up to 2000 matches.Everything runs in your local browser — no data is uploaded.
//g
Flags
g
i
m
s
u
y
Replace test
Common patterns:
Email
URL
IPv4
CN mobile
CN ID number
Date YYYY-MM-DD
CJK characters
HTML tags
Hex color
IP:port
Test text
0 match(es)
Match highlight
No data
Highlights appear as you type