Nemesis Nemesis - 8 days ago 8
Javascript Question

regex to mask IBAN

I want to mask IBAN. I have to show only first 7 characters and last 4 characters.

Example:

Input:

PL61109010140000071219812874


Output:

PL61109***********2874


I wrote the following regex:

(?<=.{7})(.*)(?=.{4})


but js do not support lookbehind

Answer

You can use groups in Regex to do that instead of LookBehind

var myString = "PL61109010140000071219812874";
var myRegexp = /\w{7}(.*)\w{4}/g;
var match = myRegexp.exec(myString);
myString = myString.replace(match[1], '*********');
console.log(myString)

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