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                * **正則匹配**:根據正則表達式匹配相應的內容 ?? * **preg\_match**( string pattern, string subject [, array matches ] );第一次匹配成功后就會停止匹配,如果要實現全部結果的匹配,即搜索到subject結尾處,則需使用 preg\_match\_all() 函數 * ?int **preg\_match\_all**( string `$pattern`, string `$subject`, array `$matches` \[, int `$flags` \] )    * **正則替換**:根據正則表達式匹配內容并替換 * **preg_replace**(`$pattern`,`$replacement`,`$subject`); * **正則分割**:根據正則表達式分割字符串,返回數組 * array **preg_split** (?string?`$pattern`?,?string?`$subject`?\[,?int?`$limit`?= -1?\[,?int?`$flags`?= 0?\]\] ) * array **split**( string pattern, string string [, int limit] )一般推薦上面的替換函數但是此函數對大小寫敏感,對大小寫有嚴格要求的用它,注意 preg\_replace\_callback — 執行一個正則表達式搜索并且使用一個回調進行替換
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