Simplifies string in currency format. Removes all thousands separators, keeps only decimal separator. Separators can be "," or ".".

parseInputNumber.js

function parseInputNumber(value) {
	
	let last = Math.max(value.lastIndexOf(","), value.lastIndexOf("."));
	if (last == -1) {
		return value;
	}
	
	let parts  = value.split(/[.,]/);
	let parsed = parts.slice(0, -1).join("");
	
	if (parts.slice(-1)[0].length <= 2) {
		parsed += value[last];
	}
	
	parsed += parts.slice(-1);
	
	return parsed;
}