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> < * ^ | & ? \ /
Each extension must start with an asterisk (*), followed by a period (.), and then the extension. The asterisk is a wildcard, which represents a file’s actual name. For example, *.pol matches 12345.pol and test.pol.
You can include wildcards in extensions. Use a question mark (?) to represent a single character and an asterisk (*) to represent two or more characters. See the following examples:
- *.*m matches the following files: ABC.dem, ABC.prm, ABC.sdcm
- *.m*r matches the following files: ABC.mgdr, ABC.mtp2r, ABC.mdmr
- *.fm? matches the following files: ABC.fme, ABC.fml, ABC.fmp
Be careful when adding an asterisk at the end of an extension as this might match parts of a file name and an unrelated extension. For example: *.do* matches abc.doctor_john.jpg and abc.donor12.pdf.
Use semicolons (;) to separate file extensions. There is no need to add a space after a semicolon.