Regex Tester Description

Test and debug regular expressions with real-time highlighting and match details.

How to use

Enter your Regular Expression (pattern).
Provide a sample text (test string).
Select flags like 'g' (global), 'i' (ignore case), or 'm' (multiline).
Matches will be highlighted in the test string.

Common Scenarios

Validating input formats (emails, phone numbers, etc.).
Extracting specific data from large text blocks using groups.
Testing complex find-and-replace patterns for coding.

Data Structure

The input consists of a Pattern string and a Test string. The output includes match indices and captured groups.

Principles

The tool uses the native JavaScript RegExp engine. It visualizes the matching process by scanning the test string and applying the pattern logic to find all occurrences.