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並前往https://stackoverflow.com/questions/69649037/why-isnumbersearch-is-function-is-returning-true-when-the-substring-is-blank

Why =isnumber(search is function is returning TRUE when the ...

You need to first check if E2 is blank and then proceed with ISNUMBER if true =IF(ISBLANK(E$2), FALSE, ISNUMBER(SEARCH(E$2,$A3))).

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