Regex Tester
Online regex testing and debugging tool
Overview
A powerful online regex testing tool with real-time match preview and capture group display. It includes a built-in template library, supports global matching and replacement operations, helping you quickly write and validate regular expressions.
Features
- Real-time regex testing
- Match result highlighting
- Capture group display
- Common regex template library
- Regex replace function
- Match position markers
- Global vs single match toggle
How It Works
- Enter the regex pattern in the expression input
- Enter the text to match in the test text area
- View real-time highlighted match results
- Expand capture groups to see each group's matched content
- Use the replace function for regex substitution
Tips
- Use preset templates to quickly start common regex matching tasks
- When debugging complex patterns, verify basic logic with simple test text first
- Capture groups are numbered from 1; $0 represents the entire match
FAQ
What are capture groups?
Capture groups are portions of a regex enclosed in parentheses () that extract specific segments from the match result for further processing.
Why are my match results empty?
Check that the regex syntax is correct, the global match flag (g) is enabled, and the test text actually conforms to the expression pattern.
Which regex syntax is supported?
Standard JavaScript regex syntax is supported, including character classes, quantifiers, anchors, groups, assertions, and more.
Tags
RegexTestMatch