Regex Visualizer

Visualize and break down regular expression patterns with explanations.

  • 100% free
  • Private in browser
  • No signup
  • No watermarks

Pattern Breakdown

42 tokens
[
a
-
z
A
-
Z
0
-
9
.
_
%
+
-
]
+
@
[
a
-
z
A
-
Z
0
-
9
.
-
]
+
\.
[
a
-
z
A
-
Z
]
{2,}

Matches

2 matches
"[email protected]"index: 14
"[email protected]"index: 35

🎨 Color Legend:

Quantifiers & special Character classes Shorthand classes Groups & alternation Anchors & boundaries Literal characters

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About Regex Visualizer

Regex Visualizer on TheToolss helps you understand complex regular expressions by breaking them into color-coded tokens with explanations. Paste any regex pattern, test it against strings, and see each part explained.

How to use Regex Visualizer

  1. Enter your regex pattern (without delimiters).
  2. Optionally enter a test string to see matches.
  3. View the color-coded token breakdown.

Key features

  • Color-coded token breakdown of regex patterns
  • Live match testing against sample strings
  • Capture group extraction
  • Flag descriptions
  • Handles character classes, quantifiers, groups, and anchors

Frequently asked questions

Do I need to include regex delimiters?
No — just enter the pattern itself. Don't include / / delimiters.