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bool isAlphaNum (
) pure nothrow @nogc @safe;
|c||The character to test.|
c is a letter or a number (0 .. 9, a .. z, A .. Z).
assert( isAlphaNum('A')); assert( isAlphaNum('1')); assert(!isAlphaNum('#')); // N.B.: does not return true for non-ASCII Unicode alphanumerics: assert(!isAlphaNum('á'));
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