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Regex Tester & Debugger

Analyze regular expressions, inspect named/indexed capture groups, preview substitutions, and debug edge cases in real time.

/ / g
Invalid regular expression
0 Matches 0.0 ms
Use $1, $2, or $&
...
No matches found.
Quick Cheatsheet
Character Classes
\d Any digit [0-9]
\w Word char [a-zA-Z0-9_]
\s Whitespace char
. Any character
[^...] Negated set
Quantifiers
+ 1 or more
* 0 or more
? 0 or 1 (optional)
{n,m} Between n and m
+? Lazy match
Anchors & Groups
^ / $ Start / End of line
\b Word boundary
(...) Capture group
(?:...) Non-capturing group
(?=...) Positive lookahead
💡 Click any token to insert it directly into your regular expression pattern.