wildcard_asterisk

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:

• *@*: 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.