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Regex Tester
Test regular expressions against text with live matches.
Input & Options
Input text
Pattern
Common: g i m s u y
g = global
i = ignore case
m = multiline (^/$ match line edges)
s = dotAll (dot matches newline)
u = Unicode (u-escapes, proper handling)
y = sticky (match only at lastIndex)
Pattern library
Select…
Email
URL
UK postcode
IPv4
Date (YYYY-MM-DD)
HTML tags
Digits
Common regex patterns (email, URL, UK postcode, IPv4, date, HTML tags, digits)
Substitution
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Results
Original text
Highlighted matches
Matches
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Substitution result
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Matches
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