Zend\Http\Header\SetCookie not compatible with older versions of pcre (and therefore CentOS)

SetCookie no longer compiles with older versions of PCRE as of 2.2.5.

This appears to be the same issue addressed in the Console Router in an earlier version.

https://github.com/zendframework/zf2/issues/4134

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Version 6.x of PCRE does not recognize ?< as a valid preg_match command.

It DOES recognize ?P<

From http://php.net/manual/en/function.preg-match.php:
"Named subpatterns now accept the syntax (?) and (?'name') as well as (?P). Previous versions accepted only (?P)."