regex-tester

소개 regex-tester

Regular expressions (regex) are powerful patterns for matching, searching, and manipulating text. Whether you're validating email addresses, parsing log files, extracting data from HTML, or performing complex find-and-replace operations, regex is an essential skill for every developer.

How to Use the Regex Tester

Enter your test string in the input area, then type your regex pattern in the Pattern field. Add flags: "g" for global match (find all), "i" for case-insensitive, "m" for multiline. The tester shows all matches with their positions and any captured groups in real time. Hover over the pattern field to see a quick reference of common patterns.

Common Regex Patterns

• ✓Email: [a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}
• ✓URL: https?://[^\s"]+
• ✓IP address: \b(?:\d{1,3}\.){3}\d{1,3}\b
• ✓Date (YYYY-MM-DD): \d{4}-\d{2}-\d{2}
• ✓Phone: \+?[\d\s\-().]{7,}

100% 무료 온라인 tool — runs entirely in your browser. No data sent to any server. No login required.