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FromCharacterCodeLetterQ

DigitQ

FilledSmallSquareDigitQ[string] yields True if all the characters in the string are digits in the range 0 through 9, and yields False otherwise.

FilledSmallSquare See The Mathematica Book: Section 2.7.4.

FilledSmallSquare See also: LetterQ, Number.

Further Examples

FromCharacterCodeLetterQ