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Tests if the letters in a character string are uppercase.




string a character string or an expression that evaluates to a character string

Return Value

1-character binary string. Evaluates to 1 ($True) if string meets the validation test; otherwise, evaluates to 0 ($False).


This function tests if a particular character string is uppercase, i.e., contains no lowercase letters.



Evaluates to $False.


Evaluates to $True.

See Also








About Character Literals

About Functional Expressions

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