Which tool or command utilizes regular expressions to search for specific text patterns within a file? 哪一個工具或指令可以利用正規表示式（Regular Expressions）來搜尋檔案中特定的文字模式？
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grep stands for Global Regular Expression Print, used for searching text inside files. find is used to search for the files themselves. grep 代表全域正規表示式列印，用於搜尋檔案內部的文字； 而 find 則是用來搜尋檔案本身的位置