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並前往https://stackoverflow.com/questions/1027224/how-can-i-test-if-a-letter-in-a-string-is-uppercase-or-lowercase-using-javascrip

How can I test if a letter in a string is uppercase or lowercase ...

The answer by josh and maleki will return true on both upper and lower case if the character or the whole string is numeric. making the result a false ...

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