Split a header value into top-level comma-separated address segments. Commas inside a quoted display name ("Doe, John" <...>) or inside angle brackets are not treated as separators.
"Doe, John" <...>
A header value such as To or Cc.
To
Cc
The trimmed, non-empty segments, in header order.
Split a header value into top-level comma-separated address segments. Commas inside a quoted display name (
"Doe, John" <...>) or inside angle brackets are not treated as separators.