Regex Tester
Test regular expressions with live matching, replace mode, code generation, and more.
Regular Expression
/
/
Flags:
Test String
Highlighted Matches
Match Details
Generate Code
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Frequently Asked Questions
What is a regular expression?
A regular expression (regex) is a sequence of characters that defines a search pattern, used for string matching, validation, and text manipulation.
What do regex flags mean?
g (global) finds all matches, i (case insensitive) ignores case, m (multiline) makes ^ and $ match line boundaries, s (dotall) makes . match newlines.
How do capture groups work?
Parentheses () create capture groups that extract specific parts of a match. Reference them with $1, $2, etc. in replacements.
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