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Regexflux

Regex Pattern Library

Browse 84+ curated regex patterns. Each one tested, explained, and ready to use with code snippets in 5 languages.

New to regex? Start with our interactive lessons or browse the cheat sheet for a quick reference.

Categories

Code & Development
8 patterns
Data Formats
19 patterns
Date & Time
10 patterns
Identifiers
8 patterns
Log Formats
4 patterns
Security
5 patterns
Validation
23 patterns
Web & Networking
7 patterns

Popular Patterns

Environment Variable Referencebeginner
(?:\$\{([A-Z_][A-Z0-9_]*)\}|\$([A-Z_][A-Z0-9_]*)\b...
JSPYTHONJAVAPHPGORUBYCSHARP
Blank Linesbeginner
^\s*$
JSPYTHONJAVAPHPGORUBYCSHARP
European Date Format (DD/MM/YYYY)beginner
(?:0[1-9]|[12]\d|3[01])/(?:0[1-9]|1[0-2])/\d{4}
JSPYTHONJAVAPHPGORUBYCSHARP
American Express Numberbeginner
3[47]\d{2}[\s-]?\d{6}[\s-]?\d{5}
JSPYTHONJAVAPHPGORUBYCSHARP
Log Levelbeginner
\b(?:DEBUG|TRACE|INFO|WARN(?:ING)?|ERROR|FATAL|CRI...
JSPYTHONJAVAPHPRUBYCSHARP
AWS Access Key IDbeginner
(?:AKIA|ASIA)[A-Z0-9]{16}
JSPYTHONJAVAPHPGORUBYCSHARP
Extract Email Domainbeginner
[\w.+-]+@([\w-]+(?:\.[\w-]+)+)
JSPYTHONJAVAPHPGORUBYCSHARP
URL with Any Protocolbeginner
[a-zA-Z][a-zA-Z0-9+.-]*://[^\s]+
JSPYTHONJAVAPHPGORUBYCSHARP
Hex Color Codebeginner
#(?:[0-9a-fA-F]{3,4}|[0-9a-fA-F]{6}|[0-9a-fA-F]{8}...
JSPYTHONJAVAPHPRUBYCSHARP
Markdown Linkbeginner
\[([^\[\]]*)]\(([^()\s]+)(?:\s+"([^"]*)")??\)
JSPYTHONJAVAPHPGORUBYCSHARP
TODO/FIXME Commentbeginner
(?://|#|/\*)\s*(?:TODO|FIXME|HACK|XXX|BUG|NOTE)\b[...
JSPYTHONJAVAPHPGORUBYCSHARP
Generic Currency Amountbeginner
[$€£¥]\s?\d{1,3}(?:[,.]\d{3})*(?:[,.]\d{2})?
JSPYTHONJAVAPHPGORUBYCSHARP