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                [Toc] >[success] # 閉包 ~~~ 1. 查具體原理 ~~~ >[danger] ##### 案例匹配大小寫 ~~~ import re text = "UPPER PYTHON,lower python, Mixed Python" def mathcase(word): def replace(m): text = m.group() if text.isupper(): return word.upper() elif text.islower(): return word.lower() elif text[0].isupper(): return word.capitalize() else: return word return replace re.sub('python',mathcase('snake'),text,flags=re.IGNORECASE) 打印結果 UPPER SNAKE,lower snake, Mixed Snake ~~~ >[danger] ##### 匹配換行 * 如果未使用,換行匹配出現的結果 ~~~ import re text = """ aaaatest/* UPPER PYTHON, lower python, Mixed Python*/ """ a = re.findall(r"/\*(.*?)\*/", text,) print(a) 打印結果: [] ~~~ * 使用非捕獲組,捕獲異常 ~~~ 其實匹配的方法就是,告訴兩種匹配開始,其中一種是從\n 開始匹配 ~~~ ~~~ import re text = """ aaaatest/* UPPER PYTHON, lower python, Mixed Python*/ """ a = re.findall(r"/\*((?:.|\n)*?)\*/", text,) print(a) 打印結果: [' UPPER PYTHON,\n lower python, Mixed Python'] ~~~ * 使用正則自帶DOTALL ~~~ import re text = """ aaaatest/* UPPER PYTHON, lower python, Mixed Python*/ """ a = re.findall(r"/\*(.*?)\*/", text,re.DOTALL) print(a) 打印結果: [' UPPER PYTHON,\n lower python, Mixed Python'] ~~~
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