I need assistance with adjusting the regex pattern for Mastercard to support both 19 digit and 16 digit cards. Can someone please provide guidance on how to modify it?
masterCardPattern: /^(?:5[1-5][0-9]{2}|222[1-9]|22[3-9][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)[0-9]{12}$/
Here is the solution
^(?:5[1-5][0-9]{2}|222[1-9]|22[3-9][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)(?:[0-9]{3}){4,5}$
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