Developer Utility

Regex Tester & Match Inspector

Test, debug, and validate regular expressions against test text in real time. 100% private, client-side evaluation.

Regular Expression Pattern:

0 Matches

/ / gm

Flags: g (Global) m (Multiline) i (Case Insensitive) s (Singleline / DotAll)

Regex Library Presets:

Test String:

Match Results & Capture Groups

Quick Regex Cheat Sheet

Character Classes

. Any character except newline
\d Any digit (0-9)
\w Word character (a-z, A-Z, 0-9, _)
\s Whitespace character
[abc] Any character in set
[^abc] Not in character set

Quantifiers

* 0 or more occurrences
+ 1 or more occurrences
? 0 or 1 occurrence
{3} Exactly 3 occurrences
{2,5} Between 2 and 5 occurrences
+? Non-greedy / lazy matching

Anchors & Groups

^ Start of string or line
$ End of string or line
\b Word boundary
(...) Capturing group
(?:...) Non-capturing group
(?=...) Positive lookahead