The following table lists supported mask format keywords for use in simple mode with the Format and Validation Function Libraries.

Keyword	Description
0	Digit, required. This element accepts any single digit between 0 and 9.
9	Digit, optional.
#	Digit, optional. Plus and minus signs, + and -, are allowed.
L	Letter, required. Restricts input to the ASCII letters a-z and A-Z. This mask element is equivalent to [a-zA-Z] in regular expressions.
?	Letter, optional. Restricts input to the ASCII letters a-z and A-Z. This mask element is equivalent to [a-zA-Z]? in regular expressions.
&	Character, required.
C	Character, optional. Any non-control character.
A	Alphanumeric, required.
a	Alphanumeric, optional.
.	Decimal placeholder. The actual display character used is the decimal placeholder appropriate to the culture option.
,	Thousands placeholder. The actual display character used is the thousands placeholder appropriate to the culture option.
:	Time separator. The actual display character used is the time placeholder appropriate to the culture option.
/	Date separator. The actual display character used is the date placeholder appropriate to the culture option.
$	Currency symbol. The actual character displayed is the currency symbol appropriate to the culture option.
<	Shift down. Converts all characters that follow to lowercase.
>	Shift up. Converts all characters that follow to uppercase.
|	Disable a previous shift up or shift down.
\	Escape. Escapes a mask character, turning it into a literal. The escape sequence for a backslash is: \ \
H	All SBCS characters.
K	SBCS Katakana.
９	DBCS Digit.
Ｋ	DBCS Katakana.
Ｊ	Hiragana.
Ｚ	All DBCS characters.
N	Matches all SBCS big Katakana.
Ｎ	Matches DBCS big Katakana.
Ｇ	Matches DBCS big Hiragana.
All other characters	Literals. All non-mask elements appear as themselves within wijinputmask. Literals always occupy a static position in the mask at run time, and cannot be moved or deleted by the user.