Regex Tester — Real-Time Regular Expression Playground
Expression Editor
//gi
Regex compiles safely! Found 0 matches.
Playground & Highlighter
Highlighted Match Output
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Match Details Grid
No regex matches found in test string.
Regex Cheat Sheet
\dAny digit (0-9)Characters
\wAlphanumeric character (a-z, A-Z, 0-9, _)Characters
\sAny whitespace (space, tab, newline)Characters
.Any single character except newlineCharacters
[abc]Any single character in the set (a, b, or c)Sets
[^abc]Any character NOT in the setSets
a*Zero or more occurrences of aQuantifiers
a+One or more occurrences of aQuantifiers
a?Zero or one occurrence of a (optional)Quantifiers
a{3}Exactly 3 occurrences of aQuantifiers
^Start of the string/lineAnchors
$End of the string/lineAnchors
\bWord boundary boundaryAnchors
(a)Capture group (remembers the match)Groups
About This Tool
Test and debug regular expressions (Regex) in real-time. Input your regex, toggle javascript expression flags, play with target strings, and view highlighted matching elements instantly. An integrated matched-group scanner and token cheat sheet helps you debug patterns.
How to Use
- Enter your regular expression pattern in the Slash input field (exclude surrounding slashes).
- Toggle Javascript regex flags: global (g), case-insensitive (i), multiline (m), or dotAll (s).
- Write or paste your test text in the Playground area.
- Observe dynamic highlighting updates: matches appear inside yellow text markers.
- Review the Sidebar grid summarizing exact indexes, matched parameters, and capture group offsets.