Characters are used to express letters, numbers, signs, etc. Characters are categorized as alphanumeric and non-alphanumeric characters. Alphanumeric characters are consist of alphabet characters and numeric characters. Other than alphanumeric characters are called as non-alphanumeric characters.
Alphanumeric Characters
Alphanumeric characters consist of alphabet and numeric characters. Alphabet characters can be lower case or upper case.
Non-Alphanumeric Characters
Non-Alphanumeric characters are except alphanumeric characters. space, percent sign, underscore, pipe, colon, semicolon, etc are non-alphanumeric characters. They can be also categorized as punctuation characters, symbol characters, etc.
(blank space)
~ (tilde)
` (grave accent)
! (exclamation mark)
@ (at)
# (pound)
$ (dollar sign)
% (percent)
^ (carat)
& (ampersand)
* (asterisk)
( (open parenthesis)
) (close parenthesis)
_ (underscore)
- (hyphen)
+ (plus sign)
= (equals)
{ (open brace)
} (close brace)
[ (open bracket)
] (close bracket)
| (pipe)
\ (backslash)
: (colon)
; (semicolon)
< (less than)
, (comma)
> (greater than)
. (period)
? (question mark)
/ (forward slash)