Parse a Message-Id or Content-Id header value.
Returns the addr-spec portion of the msg-id token.
Text or bytes to parse.
Index into the buffer to start parsing.
Optional
Number of bytes or characters to parse.
a Result; successful null means no msg-id token was found.
null
input is null or undefined.
input
startIndex or length is outside the input.
startIndex
length
Parse a Message-Id or Content-Id header value.
Returns the addr-spec portion of the msg-id token.