The Ultimate Guide to Regex Testing

Regular expressions are powerful but can be intimidating. Let's demystify them!

What is Regex?

Regular expressions (regex) are patterns used to match character combinations in strings. They're used for:

• Validation (emails, phones, URLs)
• Search and replace
• Data extraction
• Input parsing

Common Patterns

Email Validation

^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$

Phone Number

^\+?[1-9]\d{1,14}$

URL

https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)

Using Our Regex Tester

1. Enter your pattern
2. Add test strings
3. See matches highlighted in real-time
4. View capture groups

Cheat Sheet

Flags

• g - Global (find all matches)
• i - Case insensitive
• m - Multiline

Master regex and level up your development skills! 🔥