ONE REGEX TO RULE THEM
Put your separators where you want! I'll find them all.
const encryptNum = num => num.replace(/((\d[-\s.]?){4})(\d)([\s.-]?)(\d)([\s.-]?)(\d)([\s.-]?)(\d)([\s.-]?)(\d)([\s.-]?)(\d)/, '$1X$4X$6X$8X$10X$12X');
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ONE REGEX TO RULE THEM
Put your separators where you want! I'll find them all.