Using masks in string variables

Using masks for string variables is allowed. When creating masks, you can use the following regular expressions:

• Wildcard character (*)—Any string of 0 or more characters.
• Question mark (?)—Any single character.
• [<range>]—Any single character from a specified range or set.

  For example: [0–9]—Any digit. [abcdef]—Any of the characters a, b, c, d, e, or f.