Regex Tester

Test and debug regular expressions in real-time. Client-side processing.

Regular Expression
/
/
Quick Snippets
IPv4 Address
\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b
URL (Comprehensive)
\b(?:https?:\/\/)?(?:www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b(?:[-a-zA-Z0-9()@:%_\+.~#?&\/=]*)
Email Address
\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}\b
Phone (CN)
\b1[3-9]\d{9}\b
Test String
Loading Editor...
Match Results0 Match Results
No matches found.

Continue With

Continue your workflow with these related next steps
JSON Formatter

粘贴 JSON 文本 ➔ 自动校验语法错误、按缩进美化并支持树形节点展开

Diff Checker

在两侧粘贴需要对比的两段文本 ➔ 自动实时高亮比对所有增删差异

Related Tools

SQL Formatter

粘贴 SQL 查询语句 ➔ 自动规范关键字大写、多行缩进与逻辑高亮

JSON to Code

粘贴 JSON 数据样本 ➔ 自动一键生成 TypeScript/Go/Java 强类型结构定义

SQL to Code

粘贴 CREATE TABLE 建表语句 ➔ 自动解析字段并一键生成 TS/Go/Java/Rust/Python 实体类

Pure Client-Side Local Memory Processing · Zero Data Upload

Usage Guide

  • 1. Type your regex pattern and select matching flags (g, i, m, s, u).
  • 2. Paste test string in the box below to see real-time match highlights.
  • 3. Review captured regex groups, match index ranges, and substitution results.

Security & Privacy Guarantee

  • 1. Uses browser native JS engine; PCRE-specific features like variable lookbehinds are unsupported.
  • 2. Complex nested quantifier regex patterns may freeze browser UI main thread.
  • 3. Test strings are not saved online.

Frequently Asked Questions

Q: What regular expression specification does this tester use?
A: This tool uses the browser's native JavaScript (ECMAScript) regex engine, ensuring standard JS environment behavior.
Q: Is it safe to test text containing sensitive information?
A: safe. All pattern matching is processed locally on your device without any external network requests.