$ regex-tester

Test patterns, visualize matches, and learn regex with live explanations and safety hints.

Regex Workspace

Enter a pattern and test text to see live matches and explanations.

Regex Pattern

Flags

The global flag (g) is automatically enabled for match highlighting. Active flags: none.

Test Text

Characters: 0

Live Match Output

0 matches

No input.

Capture Groups

No matches yet. Try another pattern or test string.

Plain-English Explain

Enter a pattern to see the explanation.

Regex Flow

Visualization appears here.

Diagrammatic view provides a quick token flow preview.

Code Snippet

const pattern = "";
const flags = "g";
const regex = new RegExp(pattern, flags);

const matches = [..."your input".matchAll(regex)];
console.log(matches);

Regex Cheat Sheet

Character Classes

. Any character except newline (unless /s).
\d Digit [0-9].
\w Word character [A-Za-z0-9_].
\s Whitespace.
[abc] Any of a, b, or c.
[^abc] Any character except a, b, or c.

Anchors

^ Start of string/line.
$ End of string/line.
\b Word boundary.

Quantifiers

* 0 or more (greedy).
+ 1 or more (greedy).
? 0 or 1 (greedy).
{m,n} Between m and n times.
*? 0 or more (lazy).

Groups & Alternation

(...) Capturing group.
(?:...) Non-capturing group.
(?=...) Positive lookahead.
(?!...) Negative lookahead.
| Alternation (OR).