Email local part

The module 'table.email_localpart' extracts and unescapes local ("username") part of the email address.

E.g. => test "test @ a" => test @ a

Mappings for invalid emails are not defined (will be treated as non-existing values).

table.email_localpart { }

table.email_localpart_optional works the same, but returns non-email strings as is. This can be used if you want to accept both and user somewhere and treat it the same.