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Test and debug regular expressions with real-time pattern matching. Load common patterns for emails, URLs, phone numbers, and more.See matches highlighted instantly as you type.

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10+ Common Patterns
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Cheat Sheet

Common Patterns

Regular Expression

//
g: Global - Find all matches

Test String

Results

Matches Found
0

Highlighted Text

Enter a test string to see highlighted matches...

Regex Cheat Sheet

Character Classes
.
Any character except newline
\d
Digit (0-9)
\w
Word character (a-z, A-Z, 0-9, _)
\s
Whitespace
\D
Not a digit
\W
Not a word character
\S
Not whitespace
Quantifiers
*
0 or more
+
1 or more
?
0 or 1
{n}
Exactly n times
{n,}
n or more times
{n,m}
Between n and m times
Anchors
^
Start of string/line
$
End of string/line
\b
Word boundary
\B
Not word boundary
Groups
()
Capturing group
(?:)
Non-capturing group
(?<name>)
Named capturing group
|
Alternation (OR)

Best Practices

  • Test your regex with multiple test cases to ensure it works as expected
  • Use non-capturing groups (?:) when you don't need to extract the matched text
  • Be specific - avoid overly greedy patterns that match more than intended
  • Use anchors (^ and $) to match exact strings
  • Escape special characters with backslash: . * + ? ^ $ { } ( ) | [ ] \
  • Use online regex testers to validate complex patterns
  • Comment complex regex patterns to explain what they do
  • Consider performance - complex patterns can slow down your application

Powerful Features

Everything you need to test and debug regular expressions

Real-Time Testing

See your regex matches highlighted in real-time as you type. Test multiple patterns instantly.

Common Patterns

Quick-load pre-built patterns for emails, URLs, phone numbers, IP addresses, dates, and more.

Complete Cheat Sheet

Built-in reference for character classes, quantifiers, anchors, and groups to help you write better regex.

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