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<?php $emails = '"Bob Smith" <bob@company.com>, joe@company.com, "John Doe"<john@company.com>, Billy Doe<billy@company.com>'; preg_match_all('/(?|(?|"([^"]+)"|([^<@]+)) ?<(.+?)>|()(.+?))(?:$|, ?)/', $emails, $matches, PREG_SET_ORDER); var_export( array_column($matches, 1, 2) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 'bob@company.com' => 'Bob Smith', 'joe@company.com' => '', 'john@company.com' => 'John Doe', 'billy@company.com' => 'Billy Doe', )

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