Developer & Code Utility
Regex Tester & Debugger
Test regular expressions against sample text live with real-time match highlighting and group extraction.
Regular Expression
//gi
Match Results (2)
Match #1Index: 35
support@example.com
Match #2Index: 58
sales@webtools.io
How to use the Regex Tester
- Enter your Regular Expression pattern in the input box.
- Toggle matching flags such as Global (g), Case-Insensitive (i), or Multiline (m).
- Paste your sample text to inspect extracted matches in real time.
What is Regular Expression (RegEx)?
A Regular Expression is a sequence of characters that specifies a search pattern. It is widely used in programming for string search, validation, and text replacement operations.
Frequently asked questions
Is my regex testing processed securely?
Yes, all regular expression evaluations run 100% locally inside your web browser.
What flags are supported?
Global (g), Case-Insensitive (i), and Multiline (m) flags are fully supported.
Can I test complex capture groups?
Yes, standard JavaScript RegExp matching and string matchAll are utilized.