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                # 正則表達式 - 運算符優先級 正則表達式從左到右進行計算,并遵循優先級順序,這與算術表達式非常類似。 相同優先級的從左到右進行運算,不同優先級的運算先高后低。下表從最高到最低說明了各種正則表達式運算符的優先級順序: | 運算符 | 描述 | | --- | --- | | \ | 轉義符 | | (), (?:), (?=), [] | 圓括號和方括號 | | *, +, ?, {n}, {n,}, {n,m} | 限定符 | | ^, $, \任何元字符、任何字符 | 定位點和序列(即:位置和順序) | | &#124; | 替換,"或"操作 字符具有高于替換運算符的優先級,使得"m&#124;food"匹配"m"或"food"。若要匹配"mood"或"food",請使用括號創建子表達式,從而產生"(m&#124;f)ood"。 |
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