JSFiddle - React, Tailwind, and code Playground

JavaScript

function parseHindi(str) {
    return Number(str.replace(/[०१२३४५६७८९]/g, function(d) {
        return d.charCodeAt(0) - 2406;
        
    }).replace(/[०१२३४५६७८९]/g, function(d) {
        return d.charCodeAt(0) - 2415;
    }) );
}

alert(parseHindi("३५००"));