Regex Tester
Test regular expressions with real-time matching and highlighting
How to Use Regex Tester
Test and debug regular expressions with real-time match highlighting. See capture groups, test multiple flags, and validate your patterns instantly.
- 1
Enter your regex pattern
Type your regular expression in the pattern field. The tool uses JavaScript's native RegExp engine.
- 2
Set flags
Toggle flags like g (global), i (case-insensitive), m (multiline) to change matching behavior.
- 3
Add test strings
Paste or type your test text below. Matches are highlighted in real-time as you type.
- 4
Inspect matches
View all matches with their positions and capture group values in the results panel.
Frequently Asked Questions
What is a regular expression?
A regular expression (regex) is a pattern used to match character combinations in strings, widely used for text search, validation, and manipulation.
How do I test my regex?
Enter your regex pattern in the top field, your test string below, and matches will be highlighted in real-time.
What flags are supported?
This tool supports g (global), i (case-insensitive), m (multiline), s (dotAll), and u (unicode) flags.
Does it show capture groups?
Yes, all capture groups and their values are displayed for each match.
Is this tool free?
Yes, completely free with no signup required.