"[\x00-\xff]"是表示單字節字符，"[^\x00-\xff]"是表示雙字節字符
"[\x00-\xff]"是表示單字節字符，"[^\x00-\xff]"是表示雙字節字符
>>> a = '中文'
>>> a.replace(/[^\x00-\xff]/g,'@')
>>> "@@"
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4/09/2008
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