2nd/10_Wiki/Dev/Topic_PHP/PHP_RegEx.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
php-regex	PHP RegEx	Programming_Language	draft	conceptual		regular expressions PHP 정규표현식		B	0.88	2026-07-04	2026-07-04			php programming w3schools regex	https://www.w3schools.com/php/php_regex.asp

PHP RegEx

🎯 한 줄 통찰 (One-line insight)

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]

🧠 핵심 개념 (Core concepts)

• Syntax — "/pattern/modifiers" — delimiter + pattern + optional modifiers. [S1]
• Delimiter rule — any non-letter/digit/backslash/space character; / is most common, but #/~ avoid clashing with patterns containing slashes. [S1]
• Modifiers — i (case-insensitive), m (multiline — ^/$ match per-line not just whole-string), u (UTF-8 matching). [S1]
• Bracket expressions — [abc], [^abc], [a-z], [A-Z], [0-9], etc. [S1]
• Metacharacters — |, ., ^, $, \d/\D, \s/\S, \w/\W, \b, \uxxxx. [S1]
• Quantifiers — n+, n*, n?, n{3}, n{2,5}, n{3,}. [S1]
• Escaping special characters — backslash before literal special characters (e.g. /\?+/ to match one-or-more literal ?). [S1]

📖 세부 내용 (Details)

• Basic pattern: $exp = "/w3schools/i"; // case-insensitive search for "w3schools". [S1]
• Escaping special char: $pattern = '/\?+/'; // matches one or more literal question marks. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 패턴에 슬래시가 포함될 때 #나 ~로 구분자를 바꾸는 것이 실전에서 자주 쓰이는 관행이다. [S1]

💻 코드 패턴 (Code patterns)

Case-insensitive regex pattern (PHP):

$exp = "/w3schools/i";

✅ 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: PHP Tutorial
• 관련 개념: PHP RegEx Functions, PHP Superglobals Get, PHP Form Validation
• 참조 맥락: 정규표현식 문법 기초 — 정규표현식 함수(RegEx Functions) 챕터로 직접 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — PHP Regular Expressions — https://www.w3schools.com/php/php_regex.asp

📝 변경 이력 (Change history)

• 2026-07-04: Initial draft synthesized from the W3Schools "PHP Regular Expressions" page (Astra wiki-curation, P-Reinforce v3.1 format).