docs(10_Wiki): Topic_Business/General/Graphic/Programming을 Topics/ 하위로 이동

최상위 10_Wiki/Topic_*였던 4개 카테고리 폴더를 10_Wiki/Topics/Topic_* 로 재배치. 콘텐츠 변경 없음(순수 폴더 이동) — Topics/ 하위 나머지 폴더는 이미 지난 커밋에서 전부 정리된 상태(잔존 항목은 에이전트 운영 상태 및 사용자가 보존을 요청한 업데이트0615/무제 3.canvas 뿐).
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+---
+id: java-regex
+title: "Java RegEx"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["regular expressions", "자바 정규표현식"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["java", "programming", "w3schools", "regex"]
+raw_sources: ["https://www.w3schools.com/java/java_regex.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java RegEx]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Java has no built-in Regular Expression type — like dates, regex requires importing `java.util.regex` (Pattern + Matcher classes), and the search flow is explicitly two-step: `Pattern.compile()` builds the pattern object first, then `.matcher(text).find()` runs the actual search against a specific string, decoupling "what to search for" from "where to search." [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Regular expression** — a sequence of characters forming a search pattern for text search/replace. [S1]
+- **`java.util.regex` package** — required import; contains `Pattern`, `Matcher`, `PatternSyntaxException`. [S1]
+- **`Pattern.compile(regex, flags)`** — builds the pattern; flags are optional (e.g. `Pattern.CASE_INSENSITIVE`). [S1]
+- **`pattern.matcher(text)`** — returns a `Matcher` bound to a specific string. [S1]
+- **`matcher.find()`** — returns true/false depending on whether the pattern matches. [S1]
+- **Bracket expressions** — `[abc]` (any of a/b/c), `[^abc]` (none of a/b/c), `[0-9]` (digit range). [S1]
+- **Metacharacters** — `|` (alternation), `.` (any char), `^`/`$` (start/end anchors), `\d` (digit), `\s` (whitespace), `\b` (word boundary), `\uxxxx` (Unicode). [S1]
+- **Quantifiers** — `n+`, `n*`, `n?`, `n{x}`, `n{x,y}`, `n{x,}`. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic case-insensitive search: `Pattern pattern = Pattern.compile("w3schools", Pattern.CASE_INSENSITIVE); Matcher matcher = pattern.matcher("Visit W3Schools!"); boolean matchFound = matcher.find(); // true`. [S1]
+- Flags: `Pattern.CASE_INSENSITIVE`, `Pattern.LITERAL` (treats special chars as ordinary), `Pattern.UNICODE_CASE` (extends case-insensitivity beyond English). [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 대소문자 구분 없이 특정 단어의 존재 여부를 검사하는 것이 정규표현식의 가장 기본적인 실전 활용이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Case-insensitive pattern search (Java):
+```java
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+Pattern pattern = Pattern.compile("w3schools", Pattern.CASE_INSENSITIVE);
+Matcher matcher = pattern.matcher("Visit W3Schools!");
+boolean matchFound = matcher.find(); // true
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.88
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[Java Tutorial]]
+- **관련 개념:** [[Java Annotations]], [[Java Strings]], [[Java Threads]]
+- **참조 맥락:** 텍스트 검색/치환의 표준 도구 — 스레드(Threads) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Regular Expressions — https://www.w3schools.com/java/java_regex.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Regular Expressions" page (Astra wiki-curation, P-Reinforce v3.1 format).