Helper function, parses numeric input also ending with %

parseNumeric

/**
 * parseNumeric('123') === 123
 * parseNumeric('10 abc') === undefined
 * parseNumeric('10.10%') === 10.1
 * parseNumeric(' 10.1000 ') === 10.1
 * parseNumeric('10. 01%' ) === undefined
 * parseNumeric('10.0 %') === 10
 */
function parseNumeric(number) {
  var num = ('' + number).trim();
  var reOut = /^(\d+\.?\d*)\s*%?$/.exec(num);
  return reOut ? parseFloat(reOut[1]): undefined;
}