Regex Tester

What are Regular Expressions?

Regular expressions (regex) are patterns used to match character combinations in strings. They are a powerful tool for text processing, validation, and extraction used across programming languages.

How to Use This Tester

Enter your regex pattern in the first field and your test string in the textarea. Select the flags you need (global, case insensitive, multiline, dotAll) and click "Test." Matches will be highlighted in the text and listed with their positions and capture groups.

Common Regex Patterns

\d+ matches digits. [a-zA-Z]+ matches words. \b\w+@\w+\.\w+\b matches simple emails. ^https?:// matches URLs. Use parentheses () for capture groups.