Regex Tester

What is this Tool?

Regex Tester is a real-time playground for Regular Expressions. It allows developers to write, test, and debug regex patterns against sample text instantly.

Regex (Regular Expression) is a powerful sequence of characters that specifies a search pattern. It is widely used for string validation (email, phone numbers), search-and-replace, and data scraping.

How to use

1. Enter Pattern: Type your regex in the input field. It supports standard JS regex syntax (e.g., `\d+` for numbers).
2. Set Flags: Customize behavior with flags. Common ones are `g` (global), `i` (case-insensitive), and `m` (multiline).
3. Test String: Paste the text you want to check. Matching characters will be highlighted in green immediately.
4. Analyze: See the total match count and detailed breakdown of captured groups if applicable.

Why do you need it?

• Visual Debugging: Regex is notoriously hard to read. Visual highlighting makes it easier to understand *why* a pattern matches (or doesn't).
• Pre-Validation: Testing complex rules (like password strength or email format) here saves time before implementing them in your code.
• Learning Tool: Experiment with different metacharacters and see results instantly to master regex faster.

FAQ