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Regular expression in Mandarin
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==== Find Chinese characters in MySQL ==== 尋找 `column_name` 欄位值包含中文字。適用: MySQL<ref>[https://stackoverflow.com/questions/9795137/how-to-detect-rows-with-chinese-characters-in-mysql How to detect rows with chinese characters in MySQL? - Stack Overflow]</ref><ref>[https://stackoverflow.com/questions/401771/how-can-i-find-non-ascii-characters-in-mysql How can I find non-ASCII characters in MySQL? - Stack Overflow]</ref> <pre> SELECT `column_name` FROM `table_name` WHERE HEX(`column_name`) REGEXP '^(..)*(E[4-9])'; </pre> 說明 * 正則表達式 '^(..)*(E[4-9])' 的含義是尋找從字符串開始處(表示為 ^),每兩個字符(表示為 ..)重複零次或多次(表示為 *),直到找到一個匹配 (E[4-9]) 的序列。 * 透過加入 ^(..)* 使得搜尋條件更加嚴格,它要求 (E[4-9]) 的出現位置必須是在一個合法的 UTF-8 字符邊界上。這意味著它更可能正確匹配開頭為中文字符的字符串,而忽略那些僅在中間或末尾偶然包含 E4 到 E9 序列的非中文字符串。
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