测试和调试正则表达式
\d+ \w+ [a-z] (?=...)
Regular expressions (regex) are powerful patterns used to match, search, and manipulate text. This free online regex tester lets you write and test regex patterns in real time with instant match highlighting. Whether you're validating email addresses, extracting data from logs, or cleaning up text, this tool supports JavaScript regex syntax with global, multiline, case-insensitive, and other common flags. A built-in pattern library provides ready-to-use regex for common tasks.
Enter your regex pattern in the pattern field, type or paste your test text, and see matches highlighted instantly. Use the pattern library to browse common regex expressions for emails, URLs, phone numbers and more.
Regex Tester is a free online tool for testing regular expressions. It provides real-time matching with highlighted results, making it easy to debug and refine your regex patterns.
The tool uses JavaScript's native regex engine, which supports most standard regex syntax including lookahead, lookbehind, named groups, and Unicode properties.
Yes, you can enter multiple lines of test text. Each match is highlighted and the tool shows capture groups for each match.