PHP Regex Non Capturing Group
(?:yourgrouphere)
Relieved Raccoon
(?:yourgrouphere)
It is possible to name a subpattern using the syntax (?P<name>pattern).
This subpattern will then be indexed in the matches array by its normal
numeric position and also by name. PHP 5.2.2 introduced two alternative
syntaxes (?<name>pattern) and (?'name'pattern).