How to transform superscript number to real number in javascript

Question

How can you transform a string containing a superscript to normal string?

For example I have a string containing "n⁵". I would like to transform it to "n5". For the string "n⁵", i am not using any <sup></sup> tags. It is exactly like you see it.

Answer 1

To replace each character, you can assemble all the superscript characters in an ordered string (so that ⁰ is at index 0, ¹ is at index 1, etc.) and get their corresponding digit by indexOf:

function digitFromSuperscript(superChar) {
    var result = "⁰¹²³⁴⁵⁶⁷⁸⁹".indexOf(superChar);
    if(result > -1) { return result; }
    else { return superChar; }
}

You can then run each character in your string through this function. For example, you can do so by a replace callback:

"n⁵".replace(/./g, digitFromSuperscript)

Or more optimally, limit the replace to only consider superscript characters:

"n⁵".replace(/[⁰¹²³⁴⁵⁶⁷⁸⁹]/g, digitFromSuperscript)