Using tablesort.extend in browserified tablesort

index.js

'use strict';

var tablesort = require('tablesort');

function cleanNumber(i) {
  return i.replace(/[^\-?0-9.]/g, '');
}

function compareNumber(a, b) {
  a = parseFloat(a);
  b = parseFloat(b);

  a = isNaN(a) ? 0 : a;
  b = isNaN(b) ? 0 : b;

  return a - b;
}

tablesort.extend('number', function(item) {
  return item.match(/^-?[£\x24Û¢´€]?\d+\s*([,\.]\d{0,2})/) || // Prefixed currency
    item.match(/^-?\d+\s*([,\.]\d{0,2})?[£\x24Û¢´€]/) || // Suffixed currency
    item.match(/^-?(\d)*-?([,\.]){0,1}-?(\d)+([E,e][\-+][\d]+)?%?$/); // Number
  }, function(a, b) {
    a = cleanNumber(a);
    b = cleanNumber(b);
    return compareNumber(b, a);
});

tablesort(document.getElementById('sort'));