Using the Asterisk Wildcard

You can use the asterisk (*) as a wildcard in email addresses when defining routes and in file names.
 

Wildcards in Email Addresses

Wildcards can appear in the name or domain sections of an email address. The following are valid examples:

Wildcards cannot appear in a subdomain or the top-level domain. Wildcards also cannot appear with other letters; they must appear alone. The following are invalid examples:

 

Wildcards in File Names

You can use wildcard characters in file names the same way you can use them in email addresses. Use an asterisk in the name or the extension sections of a filename, but not in conjunction with a partial name or extension. The following are valid examples:

 The following are invalid examples: