Regular Expressions Made Simple: A Beginner's Guide to Regex Testing

What Are Regular Expressions?

Regular expressions (regex) are patterns used to match character combinations in strings. They're used in every programming language for validation, search, parsing, and text manipulation.

Essential Patterns to Know

• Email: [a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}
• URL: https?:\/\/[\w\-]+(\.[\w\-]+)+[\w\-.,@?^=%&:/~+#]*
• Phone: \+?[\d\s\-()]{7,15}
• Hex color: #?([0-9a-fA-F]{3}|[0-9a-fA-F]{6})

Common Regex Tokens

\d = digit, \w = word char, \s = whitespace, . = any char, * = 0+, + = 1+, ? = optional, ^ = start, $ = end.

Test Your Patterns

Use our Regex Tester to test patterns with real-time match highlighting, flags, and group display. Free and runs in your browser.