MaskBox.Mask (gb.form)
Property Mask As String
Return or set the control mask.
The mask is a string that depicts how characters are validated. If the mask is void, then the 
MaskBox acts like a normal 
TextBox.
| Mask item | Function | Default character | Description | 
|---|
| [...] | Character range | Space | Every character in the range is allowed. The syntax of the character range is the same as in the LIKE instruction. | 
| ? | Any character | Space | Any character is allowed. | 
| 0 | Mandatory digit | Zero | Any digit is allowed. | 
| #or9 | Optional digit | Space | Any digit is allowed. | 
| A | Letter | Space | Any ASCII letter is allowed. | 
| < | Right-aligned field | N/A | The characters between the last separator and the <character will be right-aligned. | 
| ! | Focus | N/A | Define where is the default character position of the control when it gets the focus. | 
| Other characters | Separator | N/A | Any other character is a separator that will be displayed as is on the screen. | 
| \ | Quoting | N/A | If you want to use a special character as a separator, you have to quote it with the \quoting character. | 
Examples
| Mask | Meaning | 
|---|
| $#,###,##0<!.## | Currency. | 
| ##0<.##0<.##0<.##0< | IPv4 address. | 
| 99/99/9999 | Some date. | 
| A[A-Za-z0-9_][A-Za-z0-9_][A-Za-z0-9_] | A four character identifier. |