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                #### 定義 ``` 正則表達式的定義: 就是用事先定義好的一些特定字符、及這些特定字符的組合,組成一個"規則字符串", 這個"規則字符串"用來表達對字符串的一種過濾邏輯 ``` #### 常用正則表達式的方法 ``` re.compile(編譯) pattern.match(從頭找一個) pattern.search(找一個) pattern.findall(找所有) pattern.sub(替換) ```
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