Regex Generator

Test Pattern

Pattern

Test String

Quick Reference

. Any char

\d Digit

\w Word char

\s Whitespace

^ Start

$ End

* 0 or more

+ 1 or more

? 0 or 1

{n} Exactly n

[abc] Char class

(x|y) Or

How to Use

Select a category to filter patterns
Click on any pattern to select it for testing
Copy the pattern using the copy button
Enter a test string to verify it works
Choose flags if needed (g, i, m)
Use in your code with the appropriate syntax

Common Use Cases

Form Validation - Email, phone, password rules
Data Extraction - Pull URLs, IPs, dates from text
Text Processing - Search and replace operations
Log Parsing - Extract patterns from log files
Input Sanitization - Remove unwanted characters

Frequently Asked Questions

What is a regular expression (regex)?

A regular expression is a sequence of characters that defines a search pattern. It's used for pattern matching in strings, validation, and text processing.

Are these patterns compatible with all programming languages?

Most patterns work across JavaScript, Python, Java, C#, and other languages. Some advanced features like lookbehinds may have limited support in certain environments.

How do I use these patterns?

Copy the pattern and use it with your language's regex functions. In JavaScript: /pattern/.test(str), in Python: re.match(pattern, str).

What do the flags mean?

Common flags: g (global - find all matches), i (case-insensitive), m (multiline - ^ and $ match line starts/ends).

How do I test a regex pattern?

Use the built-in test area on this page, or try online tools like regex101.com for detailed explanations and debugging.