alphanumeric
<character> A decimal digit or a letter (upper or lower case). Typically,
"letters" means only English letters (ASCII A-Z plus a-z) but it may also
include non-English letters in the Roman alphabet, e.g., e-acute, c-cedilla, the
thorn letter, and so on. Perversely, it may also include the underscore
character in some contexts.
(1997-09-11)
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