use_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:
*@*: Valid representation of all email addresses.
*@domain.tld, name@*.tld: Valid representation of the whole name or the domain (not the top level domain (TLD)).
*@*.tld: Valid representation of both the name and the domain (not the TLD).
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:
name@domain.*.tld: Invalid representation of a subdomain.
name@domain.*: Invalid representation of a TLD.
*name@domain.tld: Invalid use in conjunction with a name.
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 file name, but not in conjunction with a partial name or extension. The following are valid examples:
*.*: Valid representation of all files.
*.extension: Valid representation of all files of a certain extension.
name.*: Valid representation of files with a specific name but with any extension.
The following are invalid examples:
*name.*: Invalid representation of a name.
name.*extension: Invalid representation of an extension.