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79 lines
3.7 KiB
Markdown
79 lines
3.7 KiB
Markdown
---
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id: python-regex
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title: "Python 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: ["re module", "regular expressions", "파이썬 정규식"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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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: ["python", "programming", "w3schools", "regex", "re"]
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raw_sources: ["https://www.w3schools.com/python/python_regex.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[Python RegEx]]
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## 🎯 한 줄 통찰 (One-line insight)
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The `re` module's four core functions each answer a different question — findall() (all matches as a list), search() (first Match object or None), split() (list split at matches), sub() (replace matches) — and a Match object itself carries `.span()`, `.string`, `.group()` for inspecting what actually matched. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`re` module** — Python's built-in package for regular expressions. [S1]
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- **`re.findall(pattern, txt)`** — returns a list of ALL matches (empty list if none). [S1]
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- **`re.search(pattern, txt)`** — returns a Match object for the FIRST match, or `None` if no match. [S1]
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- **`re.split(pattern, txt, maxsplit)`** — splits the string at each match; `maxsplit` limits the split count. [S1]
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- **`re.sub(pattern, repl, txt, count)`** — replaces matches; `count` limits replacements. [S1]
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- **Metacharacters** — `[]` set, `\` special sequence/escape, `.` any char, `^` starts-with, `$` ends-with, `*`/`+`/`?` occurrence counts, `{}` exact count, `|` or, `()` group. [S1]
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- **Special sequences** — `\d` digit, `\D` non-digit, `\s` whitespace, `\S` non-whitespace, `\w` word char, `\W` non-word char, `\b`/`\B` word boundary, `\A`/`\Z` string start/end. [S1]
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- **Flags** — `re.IGNORECASE`, `re.MULTILINE`, `re.DOTALL`, etc. [S1]
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- **Match object properties** — `.span()` (start/end tuple), `.string` (original input string), `.group()` (the matched substring). [S1]
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## 📖 세부 내용 (Details)
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- Basic search: `x = re.search("^The.*Spain$", txt)`. [S1]
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- All matches: `x = re.findall("ai", txt)`. [S1]
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- First match only: `x = re.search("\s", txt); x.start()`. [S1]
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- Split at matches: `x = re.split("\s", txt)`. [S1]
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- Replace matches: `x = re.sub("\s", "9", txt)`. [S1]
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- Match object inspection: `x = re.search(r"\bS\w+", txt); print(x.span()); print(x.group())`. [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 — 텍스트 검증/추출(이메일 형식 검사 등)에서 표준적으로 쓰이는 도구다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Match object inspection (Python):
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```python
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import re
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txt = "The rain in Spain"
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x = re.search(r"\bS\w+", txt)
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print(x.span()) # (12, 18)
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print(x.group()) # Spain
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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:** 0.90
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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:** [[Python Tutorial]]
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- **관련 개념:** [[Python Strings Methods]], [[Python Modules]]
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- **참조 맥락:** 패턴 기반 문자열 검색/치환의 표준 도구 — 문자열 메서드로 처리하기 어려운 패턴 매칭에 사용.
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## 📚 출처 (Sources)
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- [S1] W3Schools — Python RegEx — https://www.w3schools.com/python/python_regex.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "Python RegEx" page (Astra wiki-curation, P-Reinforce v3.1 format).
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