Validation of Payment card (Visa and Master Card) Using Regular Expression

ValidationTask.js

// below are the indept explanation of some of the signs i use:-
//   (/) sign inside bracket alert the js engine that am about to declare a regular expression 
//   (^) is telling the JS engine again that what i need as the first digit is (5 if its master card, 4 if its Visa card as i declare it differently )
//    ($) This sign tells the  JS engine that am done with the parttern i want to use and validate any kind of input i need in my application
//============================================================== ======================================================
// MASTER CARD VALIDATION
// Its known very well that every payment cards has there specifi numbers of digits
// Master Card has a Total 16 digits
// Valid Master card digits always start with five (5) digit
//============================================================== ======================================================

const masterCardValidation = /^5[1-5]{1}[0-9]{2}[\s]?[0-9]{4}[\s]?[0-9]{4}[\s]?[0-9]{4}$/.test("5433 4552 2233 4645")
console.log(masterCardValidation)

//============================================================== ======================================================
// the above is the mater card validated with minimum number of 16 digits number
// the first number going to be inserted must be five (5), 
// that is what (^5) perttern above indicated code before other codes like [1-5]{1} indicating that {2} it must be within 1-5 range
// the console here calles the regular expression in terminal as to show result

// this is the mastercard validation that is cut shorter and more understandible
const masterCardValidation1 =  /^4[0-9]{4}(?:[0-9]{12})?$/.test("42244887492234558")
console.log(masterCardValidation1)

// VISA CARD VALIDATION
// in Visa card validation, its well known that the digits of Visa card always begins with four (4) and stops in thirtheen (13) or sixthen
// Below is the example of the one that stops in sixten 
const visaCardValidation = /^4[1-5]{1}[0-9]{2}[\s]?[0-9]{4}[\s]?[0-9]{4}[\s]?[0-9]{4}$/.test("4445 8623 4655 5668");
console.log(visaCardValidation)

// again below are the one that stops in 13 precisely 
const visaCardValidation2 = /^4[0-9]{13}$/.test("48834678434434");
console.log(visaCardValidation2)


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