val string_contains : ?pos:int ‑> ?len:int ‑> Core_kernel.String.t ‑> char ‑> bool
val unquoted_prefix : Core_kernel.String.t Angstrom.t
val address_part : (string option ‑> t) Angstrom.t
val email_without_prefix : t Angstrom.t
val email_with_prefix : t Angstrom.t
val email : t Angstrom.t
val email_list : t list Angstrom.t
val email_only : t Angstrom.t
val email_list_only : t list Angstrom.t