package Ġcom . very good security . vgs collect . view . card . validation . card . brand Ċ Ċ import Ġcom . very good security . vgs collect . view . card . validation . V GS Validator Ċ Ċ class ĠMaster card Delegate Ġ: ĠV GS Validator Ġby ĠDefault Card Validator ("^ (?: 5 [ 1 - 5 ][ 0 - 9 ]{ 2 }| 2 2 2 [ 1 - 9 ]| 2 2 [ 3 - 9 ][ 0 - 9 ]| 2 [ 3 - 6 ][ 0 - 9 ]{ 2 }| 2 7 [ 0 1 ][ 0 - 9 ]| 2 7 2 0 )[ 0 - 9 ]{ 1 2 }\ $ ") Ċ