fork(5) download 
<?php

$headers="From: John <john@somesite.com> To: Susy <susy@mysite.com>, Steven <steven@somesite.com>, Mary <mary@mysite.com>";
preg_match_all("/<([^><]+)/", $headers, $matches);
print_r($matches[1]);
Success #stdin #stdout 0.01s 20520KB
comments (?)
stdin 
Standard input is empty
stdout 
Array
(
    [0] => john@somesite.com
    [1] => susy@mysite.com
    [2] => steven@somesite.com
    [3] => mary@mysite.com
)
https://ideone.com/ez1Vf9
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
secret

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