Custom Angular pipe for formatting IBAN

gistfile1.txt

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({ name: 'iban' })
export class Iban implements PipeTransform {
    transform(value: string): string {
        // remove existing spaces
        let lIban: string = value.replace(" ", "");
        // place a space after every 4th character
        lIban = lIban.replace(/(.{4})/g, "$1 ");
        console.log(lIban);
        return lIban;
    }
}

nice pipe.
keep in mind that string.replace on line 6 only replaces the first space

Slightly shorter version:
...
return value.split(' ').join('').replace(/(.{4})/g, "$1 ");