Regex Tester — Free Online Developer
Test regular expressions against sample text with match highlighting. This free developer tool is designed for Indian users — it delivers instant results right in your browser with no sign-up, no registration and no hidden charges. Everything is computed locally for privacy and speed.
How to Use the Regex Tester
Using the Regex Tester is simple. Enter your values in the input fields at the top of the page and the result updates immediately. The tool follows Indian formatting (INR, lakh/crore numbering, Indian tax and measurement standards) so output is ready to use for Indian planning, filing, construction or business needs. It works on mobile, tablet and desktop.
Key Features of the Regex Tester
- Pattern input
- Test text
- Match highlighting
Why Use Our Free Developer?
ToolsOfIndia.com hosts some of the most-used free developer utilities in India. Unlike international tools, ours use India-specific rates, units, tax slabs and number formatting. There is no login, no premium tier and no data upload — your inputs never leave your device. Every tool is optimised for Core Web Vitals and mobile.
Frequently Asked Questions
What is a regular expression?
A regular expression (regex) is a pattern describing a set of strings, used for text matching, searching, and replacement. Common uses include validation (email, phone) and text extraction.
What are common regex patterns?
Common patterns: \d (digit), \w (word char), \s (whitespace), ^ (start), $ (end), * (0 or more), + (1 or more), ? (0 or 1), [a-z] (range), (group).
How to test regex?
Type your regex pattern and test string. Our tester highlights all matches in real-time, shows match groups, and provides detailed match information for debugging.
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