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69 lines
3.2 KiB
Markdown
69 lines
3.2 KiB
Markdown
---
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id: php-regex
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title: "PHP RegEx"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["regular expressions", "PHP 정규표현식"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.88
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["php", "programming", "w3schools", "regex"]
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raw_sources: ["https://www.w3schools.com/php/php_regex.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[PHP RegEx]]
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## 🎯 한 줄 통찰 (One-line insight)
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PHP regex patterns require an explicit DELIMITER character wrapping the pattern (`"/pattern/modifiers"`) — unlike some languages where the pattern is a bare string, and the delimiter itself is swappable (`#`, `~`, etc.) specifically so patterns containing literal `/` characters don't need extra escaping. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Syntax** — `"/pattern/modifiers"` — delimiter + pattern + optional modifiers. [S1]
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- **Delimiter rule** — any non-letter/digit/backslash/space character; `/` is most common, but `#`/`~` avoid clashing with patterns containing slashes. [S1]
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- **Modifiers** — `i` (case-insensitive), `m` (multiline — `^`/`$` match per-line not just whole-string), `u` (UTF-8 matching). [S1]
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- **Bracket expressions** — `[abc]`, `[^abc]`, `[a-z]`, `[A-Z]`, `[0-9]`, etc. [S1]
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- **Metacharacters** — `|`, `.`, `^`, `$`, `\d`/`\D`, `\s`/`\S`, `\w`/`\W`, `\b`, `\uxxxx`. [S1]
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- **Quantifiers** — `n+`, `n*`, `n?`, `n{3}`, `n{2,5}`, `n{3,}`. [S1]
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- **Escaping special characters** — backslash before literal special characters (e.g. `/\?+/` to match one-or-more literal `?`). [S1]
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## 📖 세부 내용 (Details)
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- Basic pattern: `$exp = "/w3schools/i"; // case-insensitive search for "w3schools"`. [S1]
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- Escaping special char: `$pattern = '/\?+/'; // matches one or more literal question marks`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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소스에서 모순되는 정보는 발견되지 않음.
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — 패턴에 슬래시가 포함될 때 #나 ~로 구분자를 바꾸는 것이 실전에서 자주 쓰이는 관행이다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Case-insensitive regex pattern (PHP):
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```php
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$exp = "/w3schools/i";
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.88
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[PHP Tutorial]]
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- **관련 개념:** [[PHP RegEx Functions]], [[PHP Superglobals Get]], [[PHP Form Validation]]
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- **참조 맥락:** 정규표현식 문법 기초 — 정규표현식 함수(RegEx Functions) 챕터로 직접 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — PHP Regular Expressions — https://www.w3schools.com/php/php_regex.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "PHP Regular Expressions" page (Astra wiki-curation, P-Reinforce v3.1 format).
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