Ptt 大爆卦 | String isalpha C++ - 前往 https://www.haskell.org/onlinereport/char.html

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The Haskell 98 Library Report: Character Utilities

isAlpha, isDigit, isOctDigit, isHexDigit, isAlphaNum :: Char -> Bool toUpper, toLower :: Char -> Char ... isAlpha c = isUpper c || isLower c isDigit c = c ...

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