A pattern facet can be used to constrain the value of a type's lexical space (the set of string literals that represent the values of a type), which indirectly constrains the value space.
The value of the pattern is called a regular expression. You can specify it using the Regular Expression wizard.
To add a pattern to a simple type, follow these steps:
To edit an existing pattern, select it in the Patterns page and click Edit. To delete an existing pattern, select it in the Patterns page and click Delete.
Related tasks
Adding
simple types