As per Adobe - There are three categories of operators which allows you to compare and constraint values using selected operators. There are three categories of operators: Standard, Data Warehouse, and Distinct Count.
The only supported wildcard character is the asterisk: *. If you need to search for *, you can escape it with a backslash.
Example: Suppose you have a page name called "My cool product". The segment rule "Page name matches My*product" will match the above page name. However, the rule "Page name matches My\\*product" matches only the page name "My*Product".
Comparison Operators for Segments