Regex Tester

正则表达式测试

在线正则表达式测试和调试工具，实时匹配结果和详细说明

正则表达式
/ /g
Flags:
测试文本 0 chars

Regex Tester

Online regex testing and debugging tool

Runs locally · Nothing uploaded

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

  1. 1 Enter the regex pattern in the expression input
  2. 2 Enter the text to match in the test text area
  3. 3 View real-time highlighted match results
  4. 4 Expand capture groups to see each group's matched content
  5. 5 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

Related tools

Tags RegexTestMatch

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.

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