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If a field is defined as alphanumeric, are spaces and underscores (_) allowed?
I hope they are not.
Can anyone confirm?
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Alphanumeric, also referred to as alphameric, is a term that encompasses all of the letters and numerals in a given language set. In layouts designed for English language users, alphanumeric characters are those comprised of the combined set of the 26 alphabetic characters, A to Z, and the 10 Arabic numerals, 0 to 9.
Non-Alphanumeric characters are the other characters on your keyboard that aren't letters or numbers, e.g. commas, brackets, space, asterisk and so on. Any character that is not a number or letter (in upper or lower case) is non-alphanumeric. These could be grouped as Punctuation characters !
An alphanumeric password contains numbers, letters, and special characters (like an ampersand or hashtag).
Alphanumeric characters are the numbers 0-9 and letters A-Z (both uppercase and lowercase). An alphanumeric example are the characters a, H, 0, 5 and k. These characters are contrasted to non-alphanumeric ones, which are anything other than letters and numbers.
Alphanumeric characters by definition only comprise the letters A to Z and the digits 0 to 9. Spaces and underscores are usually considered punctuation characters, so no, they shouldn't be allowed.
If a field specifically says "alphanumeric characters, space and underscore", then they're included. Otherwise in most cases you generally assume they're not.
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