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Note:
The comma (,), dash (-), colon (:), slash (/), period (.), and space ( ) are treated as literal values and can be included anywhere in a pattern. To include a phrase in a pattern, delimit the text string with single quotation marks ('). For example, 'Your phone number is ('999')' 999-9999 can be specified as the Display Pattern.
A
X
O
0
9
Note:
The O (capital “o”) and 0 (zero) symbols are intentional synonyms in recognition that these two characters are often mistyped and misread.
?
*
+
When submitted, the symbol matches one or more Unicode white space characters. When merged for display, it becomes a space.
See also 

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Text field patterns