AN!Wiki :: Alphanumeric
The term Alphanumeric refers to one or more characters that is a roman letter (alpha) in either upper or lower case or a number (numeric). Specifically, the letters a through z, A through Z and the numerals 0 through 9. This is sometimes expressed in regular expressions as [a-zA-Z0-9].
Conversely, the term "non-alphanumeric" refers to all other characters.
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