Developer ToolsUpdated
Regex Tester
Test regular expressions online for free. Write regex patterns, toggle flags, and see matches highlighted in real time.
#1: “user@example.com” (index: 0)
#2: “hello@world.com” (index: 17)
user@example.com
hello@world.com
Features
Handles large code files and data structures efficiently
Syntax-aware processing for accurate results
Copy, download, or export results in multiple formats
Works offline — no server round-trips needed
How to Use Regex Tester
1
Open the Tool
Navigate to the Regex Tester page to get started.
2
Provide Input
Upload your file, paste your content, or enter your data into the tool.
3
Configure Options
Adjust any available settings to customize the output to your needs.
4
Get Results
Process your data and download, copy, or save the result instantly.
Frequently Asked Questions
What regex flags are supported?▼
g (global), i (case-insensitive), m (multiline), s (dotall), u (unicode), y (sticky). Click each flag to toggle it.
Does this tool capture groups?▼
Yes. The tool shows capture groups and named groups for each match, along with the match index.