Regex Tester
Test and validate regular expressions in real-time
Drag & drop a text file
What is Regex Tester?
Regex Tester lets you write, validate, and debug regular expressions against real sample text. It is useful for form validation, log filtering, parsing URLs, and data cleaning workflows. You can test patterns with different flags and immediately see matched results, helping you build accurate expressions faster.
How to Use Regex Tester
Enter your regex pattern in the regular expression input field.
Paste sample text to test matching behavior.
Enable flags like global, case-insensitive, or multiline as needed.
Review matches and refine your pattern until expected results appear.
Key Features
Frequently Asked Questions
Is the Regex Tester tool free?
Yes. You can test unlimited regex patterns for free without login or subscription.
Which regex flags are most useful?
Global and case-insensitive flags are commonly used for search operations, while multiline is useful for line-based text validation and parsing.
Can I use this for JavaScript regex debugging?
Yes. The tester is ideal for debugging JavaScript-compatible regular expressions before integrating them into code, forms, or validation rules.