You can use regular expressions in masks for validating more complex input formats using RegexpEditMask of MaskInfo class. The Properties pane showing RegexpEditMask property for c1TextBox control is as shown:

The keywords in regular expressions and their description is shown in the following table: 

Keywords	Description
\A	Matches any upper case alphabet [A-Z].
\a	Matches any lower case alphabet [a-z].
\D	Matches any decimal digit [0-9].
\W	Matches any word character. It is same as [a-z A-Z 0-9].
\K	Matches SBCS Katakana.
\H	Matches all SBCS characters.
\ A	Matches any upper case DBCS alphabet [A-Z].
\ a	Matches any lower case DBCS alphabet [a-z].
\ D	Matches any DBCS decimal digit [0-9].
\ W	Matches any DBCS word character. It is same as [a-z A-Z 0-9].
\ K	Matches all DBCS Katakana.
\ J	Matches all Hiragana.
\ Z	Matches all DBCS characters.
\N	Matches all SBCS big Katakana.
\ N	Matches all DBCS big Katakana.
\ G	Matches DBCS big Hiragana.
\ T	Matches surrogate character.
[]	Matches a character subset.
[^]	To express an exclude subset.
-	Defines contiguous character range.
{}	Specifies the number of times to match.
*	Specifies zero or more matches. It is the short expression for {0,}.
+	Specifies one or more matches. It is the short expression for {1,}.
?	Specifies zero or one matches. It is the short expression for {0,1}.