String.prototype.isEmpty = function()
	{
		return this.match(/^\s*$/);
	}
	
	String.prototype.isInteger = function()
	{
		return this.match(/^[0-9]+$/);
	}
	
	String.prototype.isFloat = function()
	{
		return this.match(/^([0-9]+|[0-9]+\.[0-9]+)$/);
	}
	
	String.prototype.isEmail = function()
	{
		return this.match(/^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/);
	}