Regex Tester은(는) 무엇을 하나요?
Regex Tester은(는) 브라우저에서 데이터 검사을(를) 수행하며 결과와 제한을 명확히 설명합니다. 검증된 기능: JavaScript RegExp engine, Capture groups, 300 ms worker timeout, 1,000-match cap.
Test against the deployment engine
Use this page for JavaScript patterns. Verify a PCRE, Python, .NET, Java, database, or proxy pattern in that exact engine before deployment.
사용 방법
- Enter the pattern without surrounding slash characters.
- Choose JavaScript flags and paste representative test text.
- Inspect highlighted matches, indexes, and capture groups.
실제 입출력 예시
Capture a named numeric identifier
입력
Pattern: order-(?<id>\d+)
Text: order-1042출력
Match: order-1042
Named group id: 1042The browser exposes the full match and the named capture from the JavaScript RegExp result.
일반적인 오류와 해결 방법
| 현상 | 가능한 원인 | 해결 방법 |
|---|---|---|
| A valid-looking pattern is rejected. | It uses syntax from another regex engine or an unsupported browser flag. | Rewrite the expression for the target JavaScript runtime. |
| Testing times out. | The expression backtracks heavily on the supplied text. | Make repetitions more specific, reduce ambiguity, or use a parser. |
A timeout indicates expensive matching
이 도구의 구체적인 제한: Nested quantifiers and ambiguous repeated groups can cause excessive backtracking. A 300 ms timeout protects the page but does not certify production safety.
표준 및 구현 참고 자료
- MDN — RegExp (opens in a new tab)Documents JavaScript pattern syntax, flags, and match behavior.
Regex Tester — FAQ
Which regex engine is used?
The page uses JavaScript RegExp; PCRE, Python, .NET, and Java can behave differently.
Are capture groups shown?
Yes. Numbered captures and named groups are shown for displayed matches.
What does the timeout mean?
The worker is stopped after 300 ms to reduce page freezes; this is not proof that a pattern is safe.
변경 사항
실질적인 업데이트: Regex Tester: Added JavaScript flag validation, highlighted matches, capture groups, a 1,000-match cap, and 300 ms worker termination for slow patterns.