Using constant rather than plain `:host` and `::content`, also create regexp object only once
Using constant rather than plain `:host` and `::content`, also create regexp object only once

Polymer/polymer,yforrest/polymer,jordanyaker/polymer,jordanyaker/polymer,gronke/polymer,yforrest/polymer,Polymer/polymer,gronke/polymer,gazal-k/polymer,ktiedt/polymer,JeremybellEU/polymer,MartinsThiago/polymer,ikeagold/polymer,mgiuffrida/polymer,mgiuffrida/polymer,ktiedt/polymer,JeremybellEU/polymer,MartinsThiago/polymer,ikeagold/polymer,ikeagold/polymer,jordanyaker/polymer,mgiuffrida/polymer,Polymer/polymer,ktiedt/polymer,gazal-k/polymer,MartinsThiago/polymer,gazal-k/polymer,JeremybellEU/polymer,gronke/polymer,yforrest/polymer