用javascript验证regex时返回错误

/*Should match only 16 characters in total & must begin with BE and follow by 14 digits */ 
 
var re = /(?<iban>[/BE\B/(?={0-9})])/gm
     
let correctIban  = 'BE71096123456769'              // => should match
let badIbanOne   = 'BE13466123456767590kd'         // => should NOT match
let badIbanTwo   = 'BE13466123456767590679080176'  // => should NOT match
let badIbanThree = 'AZ71096123456769'              // => should NOT match

console.log(re.test(correctIban));   // => true
console.log(re.test(badIbanOne));    // => false
console.log(re.test(badIbanTwo));    // => false
console.log(re.test(badIbanThree));  // => false